KR20160051531A

KR20160051531A - current sensor using multilayered magnetic core

Info

Publication number: KR20160051531A
Application number: KR1020150057001A
Authority: KR
Inventors: 신정원
Original assignee: (주)한국센서; 신정원
Priority date: 2014-11-03
Filing date: 2015-04-23
Publication date: 2016-05-11
Also published as: KR101715792B1

Abstract

A current sensor using a laminated magnetic core is disclosed. In one embodiment, the current sensor using the laminated magnetic core includes a magnetic core having an air gap between both ends and having an opening through which a conductor through which a current to be measured can pass, and a Hall sensor disposed in the air gap do. The magnetic core includes a plurality of magnetic bodies stacked on each other. The Hall sensor receives the magnetic flux density generated by each of the plurality of magnetic bodies by the current flowing through the conductor, and measures the current through the Hall effect from the received magnetic flux density. The magnetic permeability characteristic of any one of the plurality of magnetic bodies selected from among the plurality of magnetic bodies, hereinafter referred to as a first magnetic body, is different from that of the other magnetic bodies selected from the plurality of magnetic bodies, .

Description

[0001] The present invention relates to a current sensor using a multilayered magnetic core,

BACKGROUND OF THE INVENTION Field of the Invention [0002] The present invention relates generally to current sensors using a laminated magnetic core, and more particularly to a current sensor using a Hall effect.

The current sensor is an electric part that measures the current flowing in the measured conductor. Recently, current sensors are used in various industrial fields such as industrial equipment field, electric power facility equipment field, and vehicle current sensor field.

Industries where the current sensors are applied include welding machines, power supplies, uninterruptible power supplies (UPS), machine tools, robots, and trains. In the field of electric power facilities, the electric current sensor can be applied in the form of a watt-hour meter capable of managing the electric power produced in the energy production facility. Recently, the mounting of various electric parts such as a car navigation system is increasing in vehicles. Various electrical components attached to the vehicle increase power consumption in the vehicle battery. Accurate detection of the battery current through the current sensor is necessary to properly control the charging of the vehicle battery to stably supply power to the electric components mounted on the vehicle.

The current sensor can be classified into two types, the electromagnetic induction type and the current magnetic effect type, according to the current measurement method. The electromagnetic induction type uses the induction phenomenon of the electromagnetic field, which is advantageous for the measurement of the alternating current. However, the measurement of the atypical waveform and the direct current waveform is disadvantageous in that it is difficult to measure without including a separate peripheral circuit. In addition, the electromagnetic induction type has a problem that the output signal has non-linearity with respect to frequency and a destruction phenomenon occurs at the time of over current. On the other hand, the current-sense effect type current sensor using the Hall effect exhibits non-destructive characteristics when the over-current is applied, and it is possible to measure the entire range of the DC current waveform and the irregular AC current waveform. In addition, it is possible to make the product compact and lightweight, to maintain uniform temperature characteristics, to be insulated from the measuring current power source, to be very stable, and to exhibit excellent linearity.

The current-magnetic-effect type current sensor is constituted by a magnetic core having an opening through which a conductor to be measured can pass, a magnetic core facing each other with an air gap therebetween, and a Hall sensor arranged in the air gap. The magnetic field generated in the magnetic core of the magnetic material by the current flowing through the measured conductor is provided to the Hall sensor through the air gap and the Hall sensor measures the current flowing from the magnetic field to the measured conductor. The performance of such current-effect type current sensors is influenced by the performance of the magnetic material used as the material of the magnetic core.

The ideal requirements of the magnetic material in the current-sense type current sensor include high magnetic permeability, high saturation magnetic flux density, low coercive force and temperature change characteristics. Generally, a magnetic material having a high magnetic permeability tends to exhibit poor saturation characteristics and temperature characteristics of magnetic flux density. On the other hand, a magnetic material having a low magnetic permeability tends to exhibit unfavorable characteristics that generate heat at high frequencies due to the influence of coercive force and iron loss, while the saturation characteristic and temperature characteristic of magnetic flux density are good. Therefore, it is necessary to select an appropriate magnetic material according to the current measurement environment. Silicon steel and permalloy materials are mainly used as the magnetic material of the current sensor used in the past. Silicon steel is also referred to as silicon steel (Si-Fe). Silicon steel exhibits high magnetic flux density saturation characteristics, though the sensitivity of the low current band is low, and permalloy has low sensitivity of low current band but low saturation of magnetic flux density . Therefore, permalloy is widely used as a magnetic substance in a current sensor for measuring a low current band, and silicon steel is widely used as a magnetic substance in a current sensor for measuring a high current band. Conventionally, a current sensor using a permalloy and a current sensor using a silicon steel have been manufactured and used together in order to realize a current sensor having a good sensitivity in a low current and a high current band. Such prior arts include Korean Patent No. 10-1131997 'Current sensor and Hall sensor for current sensor'.

The current sensor disclosed in this specification discloses a magnetic body in which a magnetic substance having different characteristics is stacked in order to realize a magnetic substance having a high sensitivity at a low current band and a high magnetic flux density saturation characteristic at the same time. A magnetic core formed by stacking magnetic materials having different characteristics has a high magnetic permeability at a low current band and a high magnetic flux density saturation at a high current band. Through this, current sensors disclosed herein provide high sensitivity at low current bands and can provide high saturation points at high current bands. The current sensor disclosed in the present specification can measure the Hall voltage from the magnetic flux density generated by the magnetic core and the magnetic core in which the magnetic materials having different characteristics are laminated and measure the current flowing to the measured conductor, There is a difference.

A current sensor using a laminated magnetic core is disclosed. In one embodiment, the current sensor includes a magnetic core having an air gap between both ends and having an opening through which a conductor through which a current to be measured flows can pass, and a Hall sensor disposed in the air gap. The magnetic core includes a plurality of magnetic bodies stacked on each other. The Hall sensor receives the magnetic flux density generated by each of the plurality of magnetic bodies by the current flowing through the conductor, and measures the current through the Hall effect from the received magnetic flux density. The magnetic permeability characteristic of any one of the plurality of magnetic bodies selected from among the plurality of magnetic bodies, hereinafter referred to as a first magnetic body, is different from that of the other magnetic bodies selected from the plurality of magnetic bodies, .

The foregoing provides only a selective concept in a simplified form as to what is described in more detail hereinafter. The present disclosure is not intended to limit the scope of the claims or limit the scope of essential features or essential features of the claims.

1 is a view for explaining a conventional magnetic core and a magnetic core used in a current sensor using the laminated magnetic core disclosed in this specification.
2 and 3 are views for explaining the operation of the conventional current sensor and the conventional current sensor using the Hall effect.
4 and 5 are views for explaining the current sensor using the laminated magnetic core disclosed in this specification and the operation thereof.
6 is a BH curve of the magnetic core of the current sensor using the laminated magnetic core disclosed in this specification and a Hall voltage curve relative to the measured current.

Hereinafter, embodiments disclosed in this specification will be described in detail with reference to the drawings. Like reference numerals in the drawings denote like elements, unless the context clearly indicates otherwise. The exemplary embodiments described above in the detailed description, the drawings, and the claims are not intended to be limiting, and other embodiments may be utilized, and other variations are possible without departing from the spirit or scope of the disclosed technology. Those skilled in the art will appreciate that the components of the present disclosure, that is, the components generally described herein and illustrated in the figures, may be arranged, arranged, combined, or arranged in a variety of different configurations, all of which are expressly contemplated, As shown in FIG. In the drawings, the width, length, thickness or shape of an element, etc. may be exaggerated in order to clearly illustrate the various layers (or films), regions and shapes.

When a component is referred to as being " deployed "to another component, it may include the case where the component is directly disposed on the other component, as well as the case where additional components are interposed therebetween.

When one component is referred to as being "laminated" to another component, it may include the case where the one component is directly laminated to the other component, as well as the case where additional components are interposed therebetween.

The description of the disclosed technique is merely an example for structural or functional explanation and the scope of the disclosed technology should not be construed as being limited by the embodiments described in the text. That is, the embodiments are to be construed as being variously embodied and having various forms, so that the scope of the rights of the disclosed technology should be understood to include equivalents capable of realizing the technical ideas.

It is to be understood that the singular " include " or " have " are to be construed as including the stated feature, number, step, operation, It is to be understood that the combination is intended to specify that it is present and not to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts or combinations thereof.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the disclosed technology belongs, unless otherwise defined. Terms defined in commonly used dictionaries should be interpreted to be consistent with meaning in the context of the relevant art and can not be construed as having ideal or overly formal meaning unless expressly defined in the present application.

1 is a view for explaining a conventional magnetic core and a magnetic core used in a current sensor using the laminated magnetic core disclosed in this specification. 2 and 3 are views for explaining the operation of the conventional current sensor and the conventional current sensor using the Hall effect. 4 and 5 are views for explaining the current sensor using the laminated magnetic core disclosed in this specification and the operation thereof. 6 is a graph showing a B-H curve of the magnetic core of the current sensor using the laminated magnetic core disclosed herein and a Hall voltage curve relative to the measured current.

Fig. 1 (a) is a view showing a conventional magnetic core, and Fig. 1 (b) is a view showing a magnetic core used in a current sensor using the laminated magnetic core disclosed in this specification. Referring to FIG. 1, a magnetic core 110 has an air gap 112 between its both ends, and an opening (not shown) through which a conductor 20 (see FIG. 2) (114). The magnetic core 10 used in the current sensor according to the prior art is composed of a magnetic substance made of one material. In order to reduce power loss due to eddy current, the magnetic core 10 may have a laminated structure, but the material of the magnetic body is also the same in this case.

On the other hand, the magnetic core 110 used in the current sensor using the laminated magnetic core disclosed in this specification includes a plurality of magnetic bodies stacked on each other. In the figure, a case where two magnetic bodies 10a and 10b are stacked one by one as a magnetic core 110 is shown as an example. As another example, the magnetic core 110 may be formed by stacking three or more different magnetic materials side by side, as shown in the figure. As another example, the magnetic core 110 may be formed by laminating two different magnetic bodies 10a and 10b alternately several times. As another example, unlike the drawings, the openings formed between the opposite ends of the magnetic body 10a forming the magnetic core 110 may have different distances from the openings formed between the opposite ends of the magnetic body 10b .

In the figure, a magnetic core 110 composed of different magnetic materials stacked side by side along the direction of the current (i) to be measured is shown as an example. As another example, the magnetic material may be stacked in a direction perpendicular to the direction in which the current i flows, as shown in the figure. In other words, a magnetic core having a plurality of stacked magnetic bodies may be formed by laminating one magnetic body on the inner surface of one magnetic body. As an example for the sake of understanding, the above example is not limited to the structure of the magnetic core 110 as long as the different magnetic materials are stacked. For convenience of explanation, the current sensor disclosed in this specification will be described using the magnetic core shown in Fig. 1 (b) as the magnetic core 110. Fig. It is clear that this description is not intended to limit the current sensor disclosed herein to what is described below.

On the other hand, the ratio of the thicknesses of the magnetic body 10a and the magnetic body 10b stacked in the process of stacking the different magnetic body 10a and the magnetic body 10b can be changed. This is applicable even when three or more different magnetic materials are stacked. The sensitivity and saturation characteristics of the current sensor can be adjusted by adjusting the thickness ratio. Further, the permeability of the magnetic flux density applied to the current sensor and the average value of the saturation magnetic flux density can be adjusted through adjustment of the thickness ratio.

As the material of the magnetic bodies 10, 10a and 10b, various materials can be used. As the material of the magnetic material 10, 10a, 10b applied to the current sensor, a soft magnetic material having a high permeability and a low coercive force may be preferable. The soft magnetic material may be, for example, Si-Fe, Ni-Fe, Mn-Zn, Co-based amorphous alloy or Fe-based amorphous alloy.

In one embodiment, the magnetic permeability characteristic of any one of the plurality of magnetic bodies selected from among the plurality of magnetic bodies, hereinafter referred to as a first magnetic body, may be any other magnetic body selected from the plurality of magnetic bodies, hereinafter referred to as a second magnetic body And may have properties different from those of the magnetic permeability. For example, the second magnetic material may have a higher permeability than the first magnetic material, and the first magnetic material may have a larger saturated magnetic flux density than the second magnetic material. In this case, silicon steel may be used as the first magnetic material, and permalloy steel may be used as the second magnetic material. Generally, silicon steel has a lower magnetic permeability than permalloy steel, but has a higher saturation magnetic flux density than permalloy steel. The magnetic core 110 of the current sensor disclosed in this specification includes the first magnetic body and the second magnetic body which are stacked on each other. In addition, the second magnetic body has a larger permeability than the first magnetic body, and the first magnetic body has a larger saturated magnetic flux density than the second magnetic body. Accordingly, the current sensor using the laminated magnetic core disclosed in this specification can provide a relatively high sensitivity at a low current band as compared with the sensitivity provided by the conventional current sensor having the magnetic core composed only of the first magnetic body. At the same time, the current sensor using the laminated magnetic core disclosed in this specification can provide a high saturation point in the high current band as compared with the conventional current sensor having the magnetic core composed only of the second magnetic body.

2 is a view showing a conventional current sensor using a Hall effect. Referring to FIG. 2, a conventional current sensor 1 includes a magnetic core 10 and a hall sensor 120. The Hall sensor 120 is disposed in an air gap 12 formed between both ends of the magnetic core 10. The conductor 20 through which the current i to be measured flows passes through the opening 14 of the magnetic core 10. The current flowing to the conductor 20 forms a magnetic field around the magnetic core 10, and the magnetic field generates a magnetic flux density B in the magnetic core 10. The generated magnetic flux density B is transmitted to the Hall sensor 120 disposed in the air gap 12 and the hall sensor 120 is generated from the received magnetic flux density B and the control current I flowing through the Hall sensor 12 And measures the Hall voltage VH to detect the magnitude of the current i. The specific operation of the conventional current sensor will be described in detail with reference to FIG. 3 to be described later.

3 is a view for explaining the operation of the conventional current sensor. 3 is a diagram for explaining the generation of a Hall voltage by a Hall effect. When the magnetic flux density B is applied to the path through which the control current I flows in the course of the control current I flowing through the hall sensor 120, the current carrier is subjected to the Lorentz force . The Lorentz force can be expressed by the electric charge q of the current transmitter, the velocity v of the current transmitter, and the magnetic flux density B applied to the current transmitter. Hereinafter, electrons will be mainly described as a current transmitter.

For convenience of explanation, the control current I flowing in a direction perpendicular to the magnetic flux density B is shown as an example in the figure. In the case where the control current I flows at a predetermined angle rather than a direction perpendicular to the magnetic flux density B, the Lorentz force can be calculated using the formula for the Lorentz force.

As shown in the figure, the electrons move by the Lorentz force so that an electric field E is formed at both ends of the conductor 120a through which the control current I flows. Then, electric force and Lorentz force It becomes equilibrium as the following formula.

That is, the hole voltage VH is generated at both ends of the conductor 120a through which the control current I flows by the electric field formed by the movement of the electron Lorentz force and the electron movement. The electric field corresponds to the Hall voltage, and the charge q and the moving velocity v of the electron correspond to the control current I. The Hall voltage VH is proportional to the control current I and the magnetic flux density B as shown in the following equation and shows a characteristic inversely proportional to the thickness t of the conductor 120a.

The magnetic flux density B shows a characteristic proportional to the current i flowing through the conductor 20 and the magnetic permeability of the magnetic body 10, as shown in the following equation.

Where mu is the relative permeability

Therefore, the Hall voltage VH is determined by the control current I flowing through the hall sensor 120, the magnetic permeability of the magnetic body 10 constituting the magnetic core, and the current flowing through the conductor 20 i and is in inverse proportion to the thickness t of the conductor 120a through which the control current I flows in the hall sensor 120. [

On the other hand, in the case of the constant current drive, since the Hall voltage VH is proportional to the product of the control current I and the magnetic flux density B, the field sensitivity of the hall sensor 120 is usually set to a product sensitivity Is used. The magnetic field sensitivity SI of the Hall sensor 120 according to the total sensitivity is defined by the following equation.

Here, the unit of S is (mV / mA · kG)

Since the Hall voltage VH is proportional to the product of the control voltage V and the magnetic flux density B in the case of the constant voltage drive, the magnetic field sensitivity SV of the Hall sensor 120 is defined by the following equation.

Here, the unit of S is ((mV / mA · kG)

For convenience of explanation, the case of constant current driving will be mainly described. It will be apparent that the following description can also be applied to the case of constant voltage driving.

The Hall voltage VH is proportional to the product of the control current I and the magnetic flux density B and the magnetic flux density B is proportional to the magnetic permeability of the magnetic body 10, It is influenced by the material properties of the magnetic material used as the material.

The characteristics of the Hall voltage (VH) when silicon steel and permalloy steel are used as the magnetic body 10 constituting the magnetic core will be described below. Generally, silicon steel has a lower magnetic permeability than permalloy steel, but has a higher saturation magnetic flux density than permalloy steel. 6 (a) is a view showing a B-H curve of a general magnetic body. The magnetic substance 1 of FIG. 6A corresponds to silicon steel, and the magnetic substance 2 corresponds to permalloy steel. In FIG. 6A, H may correspond to the current (i) flowing in the conductor 20. This can be easily understood from the Maxwell equation applied to the entire electromagnetic field.

The Hall voltage VH is proportional to the magnetic permeability of the magnetic body when the control current I, the current i flowing through the conductor 20 and the thickness t of the conductor 120a through which the control current I flows are constant. . That is, the larger the magnetic permeability of the magnetic body under the same condition, the larger the Hall voltage VH can be obtained. Therefore, it is necessary to utilize a magnetic material having a high magnetic permeability as a magnetic core material in a low current band where it is necessary to effectively measure the current (i) from the ambient noise.

On the other hand, in the case of a magnetic material having a high magnetic permeability in general, as shown in FIG. 6 (a), saturation characteristics are exhibited at a low magnetic flux density (B). The magnetic permeability can be defined as a slope in the B-H curve, and the magnetic material 2 has a permeability higher than that of the magnetic material 1. Also, in the case of a magnetic material having a low magnetic permeability in general, as shown in Fig. 6 (a), saturation characteristics are exhibited at a large magnetic flux density (B).

A current sensor using a magnetic material having a magnetic characteristic exhibiting saturation characteristics at a low magnetic flux density B as a magnetic core has a saturation characteristic at a low Hall voltage VH as shown in FIG. 6 (b). On the other hand, a current sensor using a magnetic material having a saturation characteristic at a large magnetic flux density B as a magnetic core has a saturation characteristic at a large Hall voltage (VH) as shown in FIG. 6 (b). That is, the B-H curve of the magnetic body used as the magnetic core and the i-VH curve of the current sensor using this magnetic body correspond to each other. It will be appreciated that those skilled in the art, having ordinary skill in the art to which the present disclosure relates, will be able to fully anticipate the foregoing formulas.

In summary, the current sensor using the same magnetic material as the material of the magnetic core exhibits a good sensitivity at a low current band but a bad saturation characteristic or a bad sensitivity at a low current band but a good saturation characteristic. That is, the current sensor through the magnetic core made of the same type of magnetic material has a problem that it is difficult to realize a current sensor having good sensitivity in a low current band and good saturation characteristics in a high current band in which a relatively large current flows. The present invention proposes a current sensor which provides a good sensitivity characteristic at a low current band and at the same time has a good saturation characteristic in a high current band in which a relatively large current flows. A detailed description thereof will be described in detail with reference to FIGS. 4 and 5 to be described later.

4 and 5 are views for explaining the current sensor using the laminated magnetic core disclosed in this specification and the operation thereof. 5 is a diagram for explaining the operation of the current sensor using the laminated magnetic core disclosed in this specification using the Hall effect. 5 is a view for explaining the generation of Hall voltage by the magnetic core 110 formed by stacking different magnetic materials 10a and 10b. Referring to FIG. 5, the operation of the current sensor 100 using the laminated magnetic core disclosed in this specification will be described as follows.

When the magnetic flux density B is applied to the path through which the control current I flows in the course of the control current I flowing through the hall sensor 120, the current carrier is subjected to the Lorentz force . The current sensor 100 disclosed in this specification is different from the conventional current sensor in that the magnetic flux density B1 and the magnetic flux density B2 generated by the magnetic body 10a and the magnetic body 10b in the path through which the control current I flows, Is applied. For convenience of explanation, the control current I flowing in a direction perpendicular to the magnetic flux density B1 and the magnetic flux density B2 is shown as an example. When the control current I flows at a predetermined angle other than a direction perpendicular to the magnetic flux density B1 and the magnetic flux density B2, the Lorentz force can be calculated using the above equation for the Lorentz force.

As shown in the figure, electrons as electric currents are moved by the Lorentz force, and an electric field is formed at both ends of the conductor 120a through which the control current I flows. Then, electric force and Lorentz force They are in equilibrium with each other. That is, electrons are moved by the Lorentz force, and the Hall voltage VH is generated at both ends of the conductor 120a through which the control current I flows. This has been described above with reference to FIG. The current sensor 100 disclosed in this specification applies the magnetic flux density B1 and the magnetic flux density B2 generated by the different magnetic material 10a and the magnetic material 10b to the path through which the control current I flows . Therefore, the electrons moving in the region of the magnetic flux density B1 experience the force of Fm1 as the Lorentz force, and the electrons moving in the region of the magnetic flux density B2 experience the force of Fm2 as the Lorentz force. The hole voltage generated in the region experiencing the force of Fm1 and the hole voltage generated in the region experiencing the force of Fm2 are generated when the region of the magnetic flux density B1 and the region of the magnetic flux density B2 are physically separated from each other Have different values.

The magnetic substance 10a and the magnetic substance 10b can be selected so that the saturation magnetic flux density of the magnetic substance 10a is larger than the saturation magnetic flux density of the magnetic substance 10b but the magnetic permeability of the magnetic substance 10a is smaller than that of the magnetic substance 10b have. Silicon steel (Si-Fe) may be used as the magnetic body 10a and permalloy steel (Ni-Fe) may be used as the magnetic body 10b. In this case, as described above with reference to Fig. 3, the sensitivity characteristic in the low current band of the Hall voltage generated in the region experiencing the force of Fm1 is lower than the Hall voltage low current band generated in the region experiencing the force of Fm2 Which is worse than the sensitivity characteristic at the < RTI ID = 0.0 > On the other hand, the saturation characteristic in the high current band of the Hall voltage generated in the region experiencing the force of Fm1 is better than the saturation characteristic in the high current band of the Hall voltage generated in the region experiencing the Fm2 force.

The current sensor 100 disclosed in this specification includes a hall sensor 120 disposed over a region of magnetic flux density B1 and a region of magnetic flux density B2. In other words, electrons, which are current transmitters of the control current I flowing through the hall sensor 120, experience the magnetic flux density B1 and the magnetic flux density B2 at the same time as they move through the conductor 120a. Holes generated at both ends of the lead 120a by the magnetic flux density B1 are referred to as a first hole voltage and a magnetic flux density B2 are generated at both ends of the lead 120a by the magnetic flux density B1. Voltage - referred to as second hole voltage hereinafter) have different values. These different Hall voltages are generated at both ends of the electric conductor 120a, and the cathodes and the anodes of these Hall voltages are electrically connected to each other. That is, the Hall voltage measured by the current sensor 100 disclosed in this specification can be interpreted as a voltage measured from the first Hall voltage and the second Hall voltage, which are electrically connected in parallel to each other. When a power supply providing voltages of different sizes is connected in parallel to each other, the voltage measured externally is a large voltage among the voltages connected in parallel. Therefore, as shown by the dotted line in FIG. 6 (b), the Hall voltage measured by the current sensor 100 disclosed in the present specification is the same as that of the second hole And the first hall voltage having a good saturation characteristic in the high current band plays a main role in the high current band. Accordingly, the current sensor 100 disclosed in the present specification has a relatively large sensitivity in a low current band compared to the sensitivity provided by a conventional current sensor having a magnetic core composed of only a magnetic material (for example, a magnetic material 10a) Can be provided. At the same time, the current sensor 100 disclosed in this specification can provide a high saturation point in a high current band as compared with a conventional current sensor having a magnetic core composed only of a magnetic material (for example, a magnetic material 10b) of the same material .

Meanwhile, when the first Hall voltage and the second Hall voltage are electrically connected in parallel, charge can move to a region having a relatively high potential and a region having a relatively low potential. The potential of the region having a relatively high potential is lowered through the movement of the charge, and the region having a relatively low potential has a higher potential to form an equilibrium of the potential. That is, the Hall voltage measured by the current sensor 100 may be any value existing between a potential having a relatively high potential and a potential having a relatively low potential. The Hall voltage measured by the current sensor 100 can be adjusted by adjusting the ratio of the area occupied by the magnetic flux density B1 and the area occupied by the magnetic flux density B2 in the entire magnetic core 110. [ In other words, it is possible to adjust the Hall voltage measured by the current sensor 100 through adjustment of the thickness ratio of the magnetic body 10a and the magnetic body 10b constituting the magnetic core 110. [ The Hall voltage VH is proportional to the magnetic permeability of the magnetic body when the control current I, the current i flowing through the conductor 20 and the thickness t of the conductor 120a through which the control current I flows are constant. I have mentioned above. Therefore, adjustment of the thickness ratio of the magnetic body 10a and the magnetic body 10b constituting the magnetic core 110 may mean adjustment of the permeability and the saturation magnetic flux density of the magnetic flux density applied to the current sensor 100. [ Accordingly, the current sensor 100 disclosed in the present specification has a relatively large sensitivity in a low current band compared to the sensitivity provided by a conventional current sensor having a magnetic core composed of only a magnetic material (for example, a magnetic material 10a) Can be provided. At the same time, the current sensor 100 disclosed in this specification can provide a high saturation point in a high current band as compared with a conventional current sensor having a magnetic core composed only of a magnetic material (for example, a magnetic material 10b) of the same material .

Hereinafter, functions and operations of the current sensor 100 using the laminated magnetic core disclosed in this specification will be described.

4, a current sensor 100 using a laminated magnetic core includes a magnetic core 110 and a Hall sensor 120. [

The magnetic core 110 has an air gap 112 between both ends and has an opening 114 through which the conductor 20 through which the current i to be measured flows can pass. The magnetic core 110 includes a plurality of magnetic bodies stacked on each other. The magnetic permeability characteristic of any one of the plurality of magnetic bodies selected from among the plurality of magnetic bodies, hereinafter referred to as a first magnetic body, is different from that of the other magnetic bodies selected from the plurality of magnetic bodies, . For example, the first magnetic material may be formed of a Si-Fe based material, and the second magnetic material may be formed of a Ni-Fe based material.

The Hall sensor 120 is disposed in the air gap 112. The hall sensor 120 receives the magnetic flux density generated by each of the plurality of magnetic bodies by the current i flowing through the conductor 20 and measures the current i through the Hall effect from the received magnetic flux density do.

In the figure, a case where two magnetic bodies 10a and 10b are stacked one by one as a magnetic core 110 is shown as an example. For convenience of explanation, the functions and characteristics of the current sensor 100 using the laminated magnetic core disclosed in this specification are described with the magnetic body 10a corresponding to the first magnetic body and the magnetic body 10b corresponding to the second magnetic body . The functions and characteristics of the current sensor 100 will be described in terms of the Hall voltage VH of the current sensor 100 and the magnetic permeability characteristic of the magnetic core 110. [

First, the characteristics of the current sensor 100 will be described in terms of the Hall voltage VH of the current sensor 100. FIG.

As shown in the figure, the current sensor 100 disclosed in this specification includes a magnetic core 110 and a Hall sensor 120 formed by stacking a magnetic body 10a and a magnetic body 10b having different characteristics .

In one embodiment, the second magnetic body 10b has a larger permeability than the first magnetic body 10a, and the first magnetic body 10a can have a larger saturated magnetic flux density than the second magnetic body 10b. The hall sensor 120 measures the magnetic flux density-hereinafter referred to as a first magnetic flux density-generated by the first magnetic body 10a from the current i flowing in the conductor 20 and the magnetic flux density generated by the second magnetic body 10b - hereinafter referred to as a second magnetic flux density, and measures the current (i) through the Hall effect from the received first magnetic flux density and the second magnetic flux density. In this case, the sensitivity of the hole voltage VH of the Hall sensor 120 is affected by the magnetic flux density provided by the magnetic core 110. The magnetic flux density is generated by the magnetic core 110 by the current (i) flowing in the conductor 20 and provided to the Hall sensor 120. The magnetic flux density is influenced by the magnetic permeability of the magnetic core 110. Since the magnetic core 110 includes the first magnetic body 10a and the second magnetic body 10b stacked on each other and the second magnetic body 10b has a larger permeability than the first magnetic body 10a, The sensitivity of the Hall voltage (VH) of the first magnetic body (120) has a relatively high sensitivity in the low current band as compared with the sensitivity provided by the magnetic core composed only of the first magnetic body (10a). This can be inferred from the above description with reference to FIG. 5, so that a detailed description thereof will be omitted for the sake of explanation.

The saturation Hall voltage of the hall sensor 120 is affected by the saturation magnetic flux density of the magnetic flux density provided by the magnetic core 110. The magnetic core 110 includes a first magnetic body 10a and a second magnetic body 10b stacked on each other and the first magnetic body 10a has a larger saturation magnetic flux density than the second magnetic body 10b, The saturated Hall voltage of the sensor 120 is generated in a relatively large voltage region compared to the saturated Hall voltage provided by the magnetic core composed of only the second magnetic body 10b. This can be inferred from the above description with reference to FIG. 5, so that a detailed description thereof will be omitted for the sake of explanation.

The current sensor 100 disclosed in the present specification can control the Hall voltage VH of the Hall sensor 120 by adjusting the ratio of the first magnetic body 10a and the second magnetic body 10b in the magnetic core 110. [ And the saturation hole voltage. In other words, the first magnetic body 10a and the second magnetic body 10b may be stacked side by side with different heights on the basis of the traveling direction of the current (i) flowing in the conductor 20, for example, have. In this case, the ratio of the height of the second magnetic body 10b to the height of the first magnetic body 10a in the magnetic core 110 or the ratio of the height of the first magnetic body 10a to the height of the second magnetic body 10b The sensitivity of the Hall voltage (VH) of Hall sensor 120 and the saturation Hall voltage can be adjusted by adjusting the ratio of the height. Of course, it is also possible to adjust the sensitivity of the Hall voltage (VH) of Hall sensor 120 and the saturation Hall voltage by laminating additional magnetic bodies and adjusting the ratio of them to the total magnetic core (110). The details of this are as follows.

In another embodiment, unlike the one shown in the drawings, the current sensor 100 disclosed in this specification may further include additional magnetic bodies in addition to the first magnetic body 10a and the second magnetic body 10b. In other words, the current sensor 100 disclosed in this specification includes a plurality of the magnetic bodies stacked on each other as described above. In this case, the magnetic permeability characteristic of any one of the plurality of magnetic bodies selected from among the plurality of magnetic bodies, hereinafter referred to as a first magnetic body, is different from the magnetic permeability characteristic of any other magnetic body selected from the plurality of magnetic bodies, They have different characteristics.

The first magnetic body 10a has the largest saturation magnetic flux density among the plurality of magnetic bodies and the second magnetic body 10b has the largest magnetic permeability among the plurality of magnetic bodies. The Hall sensor 120 measures the magnetic flux density generated by the first magnetic body 10a from the current i flowing in the conductor 20-hereinafter referred to as the first magnetic flux density, and the magnetic flux density generated by the second magnetic body 10b (Hereinafter referred to as a second magnetic flux density) and the other magnetic bodies (not shown) except for the first magnetic body 10a and the second magnetic body 10b among the plurality of magnetic bodies - hereinafter referred to as a third magnetic body - Density (hereinafter referred to as a third magnetic flux density), and measures the current (i) through the Hall effect from the received first magnetic flux density, the second magnetic flux density and the third magnetic flux density. In this case, the sensitivity of the hole voltage VH of the Hall sensor 120 is affected by the magnetic flux density provided by the magnetic core 110. The magnetic flux density is generated by the magnetic core 110 by the current (i) flowing in the conductor 20 and provided to the Hall sensor 120. The magnetic flux density is influenced by the magnetic permeability of the magnetic core 110. The saturation Hall voltage of the hall sensor 120 is affected by the saturation magnetic flux density of the magnetic flux density provided by the magnetic core 110. Therefore, the sensitivity of the Hall voltage of the hall sensor 120 and the saturation Hall voltage can be adjusted by adjusting the ratio of the first magnetic body 10a and the second magnetic body 10b in the magnetic core 110. [

Next, characteristics of the current sensor 100 will be described in terms of the magnetic permeability characteristic of the magnetic core 110. FIG.

In one embodiment, the second magnetic body 10b has a larger permeability than the first magnetic body 10a, and the first magnetic body 10a can have a larger saturated magnetic flux density than the second magnetic body 10b. The hall sensor 120 measures the magnetic flux density-hereinafter referred to as a first magnetic flux density-generated by the first magnetic body 10a from the current i flowing in the conductor 20 and the magnetic flux density generated by the second magnetic body 10b - hereinafter referred to as a second magnetic flux density, and measures the current (i) through the Hall effect from the received first magnetic flux density and the second magnetic flux density. In other words, the current sensor 100 disclosed in this specification uses the Hall sensor 120 that receives the first magnetic flux density and the second magnetic flux density at the same time, i) is measured. In this case, the magnetic core 110 formed by stacking the first magnetic body 10a and the second magnetic body 10b may have a relatively large magnetic permeability as compared with the magnetic core composed entirely or on average of only the first magnetic body 10a have. The magnetic core 110 in which the first magnetic body 10a and the second magnetic body 10b are laminated can have a relatively large saturation magnetic flux density as compared with the magnetic core composed only of the second magnetic body 10b. Of the first and second magnetic bodies 10a and 10b which are laminated together to form the magnetic core 110, the second magnetic body 10b has a larger permeability than the first magnetic body 10a, 10a have a larger saturation magnetic flux density than the second magnetic body 10b.

The current sensor 100 disclosed in the present specification can adjust the magnetic permeability and the saturation magnetic flux density of the magnetic core 110 by adjusting the ratio of the first magnetic body 10a and the second magnetic body 10b in the magnetic core 110 Can be adjusted. In other words, the first magnetic body 10a and the second magnetic body 10b may be stacked side by side with different heights on the basis of the traveling direction of the current (i) flowing in the conductor 20, for example, have. In this case, the ratio of the height of the second magnetic body 10b to the height of the first magnetic body 10a in the magnetic core 110 or the ratio of the height of the first magnetic body 10a to the height of the second magnetic body 10b The magnetic permeability of the magnetic core 110 and the saturation magnetic flux density can be adjusted by controlling the ratio of the height. Of course, it is also possible to adjust the permeability and the saturation flux density of the magnetic core 110 by laminating additional magnetic bodies and controlling the ratio of these to the total magnetic core 110. The details of this are as follows.

The first magnetic body 10a has the largest saturation magnetic flux density among the plurality of magnetic bodies and the second magnetic body 10b has the largest magnetic permeability among the plurality of magnetic bodies. The Hall sensor 120 measures the magnetic flux density generated by the first magnetic body 10a from the current i flowing in the conductor 20-hereinafter referred to as the first magnetic flux density, and the magnetic flux density generated by the second magnetic body 10b (Hereinafter referred to as a second magnetic flux density) and the other magnetic bodies (not shown) except for the first magnetic body 10a and the second magnetic body 10b among the plurality of magnetic bodies - hereinafter referred to as a third magnetic body - Density (hereinafter referred to as a third magnetic flux density), and measures the current (i) through the Hall effect from the received first magnetic flux density, the second magnetic flux density and the third magnetic flux density. In this case, since the first magnetic body 10a has the largest saturation magnetic flux density and the second magnetic body 10b has the largest magnetic permeability, the first magnetic body 10a and the second magnetic body 10b The magnetic permeability and the saturation magnetic flux density of the magnetic core 110 can be adjusted.

Referring to the drawings and the above description, the current sensor 100 using the laminated magnetic core disclosed in the present specification has different characteristics in order to realize a magnetic body having a high sensitivity at a low current band and a high magnetic flux density saturation characteristic at the same time And a magnetic core formed by laminating a magnetic body having a magnetic core. A magnetic core formed by stacking magnetic materials having different characteristics has a high magnetic permeability at a low current band and a high magnetic flux density saturation at a high current band. Accordingly, the current sensor using the laminated magnetic core disclosed in this specification can simultaneously provide a high sensitivity in a low current band and a high saturation point in a high current band which can not be provided by a conventional current sensor using a magnetic material of the same material .

From the foregoing it will be appreciated that various embodiments of the present disclosure have been described for purposes of illustration and that there are many possible variations without departing from the scope and spirit of this disclosure. And that the various embodiments disclosed are not to be construed as limiting the scope of the disclosed subject matter, but true ideas and scope will be set forth in the following claims.

1: Conventional current sensor
10: Conventional magnetic core
10a: magnetic substance
10b: magnetic substance
12: Air gap
14: opening
100: Current sensor using laminated magnetic core
110: magnetic core
112: air gap
114: opening
120: Hall sensor
120a: conductor

Claims

A magnetic core having an air gap between both ends thereof and having an opening through which a conductor through which a current to be measured flows can pass; And
And a Hall sensor disposed in the air gap,
Wherein the magnetic core includes a plurality of magnetic bodies stacked on each other,
Wherein the Hall sensor receives the magnetic flux density generated by each of the plurality of magnetic bodies by the current flowing through the conductor and measures the current through the Hall effect from the received magnetic flux density,
The magnetic permeability characteristic of any one of the plurality of magnetic bodies selected from the plurality of magnetic bodies, hereinafter referred to as the first magnetic body, is different from that of the other magnetic bodies selected from the plurality of magnetic bodies, Wherein the magnetic sensor is a magnetic sensor.

The method according to claim 1,
Wherein the first magnetic body and the second magnetic body are stacked side by side along the traveling direction of the current to be measured flowing through the conductor.

The method according to claim 1,
Wherein the second magnetic body has a larger permeability than the first magnetic body, the first magnetic body has a larger saturation magnetic flux density than the second magnetic body,
The Hall sensor detects a magnetic flux density generated by the first magnetic body - hereinafter referred to as a first magnetic flux density, and a magnetic flux density generated by the second magnetic body - hereinafter referred to as a second magnetic flux density, from the current flowing in the conductor And measuring the current through the Hall effect from the received first magnetic flux density and the second magnetic flux density,
The sensitivity of the Hall voltage of the Hall sensor is affected by the magnetic flux density provided by the magnetic core,
Wherein the magnetic flux density is generated by the magnetic core by the current flowing through the conductor and is provided to the Hall sensor,
The magnetic flux density is affected by the magnetic permeability of the magnetic core,
The magnetic core includes the first magnetic body and the second magnetic body laminated to each other and the second magnetic body has a higher permeability than the first magnetic body,
The sensitivity of the Hall voltage of the Hall sensor has a relatively high sensitivity in a low current band as compared with a sensitivity provided by a magnetic core composed of only the first magnetic body,
The saturation Hall voltage of the Hall sensor is influenced by the saturation magnetic flux density of the magnetic flux density provided by the magnetic core,
Since the magnetic core includes the first magnetic body and the second magnetic body stacked on each other and the first magnetic body has a larger saturation magnetic flux density than the second magnetic body,
Wherein the saturation Hall voltage of the hall sensor is generated in a voltage region relatively large compared to a saturation Hall voltage provided by a magnetic core composed only of the second magnetic body.

The method of claim 3,
Wherein the first magnetic body and the second magnetic body are stacked in parallel with each other at different heights based on a traveling direction of the current to be measured flowing through the conductor,
By controlling the ratio of the height of the second magnetic body to the height of the first magnetic body or the ratio of the height of the first magnetic body to the height of the second magnetic body in the magnetic core, And the saturation Hall voltage can be adjusted.

The method according to claim 1,
Wherein the first magnetic body has the largest saturation magnetic flux density among the plurality of magnetic bodies,
Wherein the second magnetic body has the largest magnetic permeability among the plurality of magnetic bodies,
The hall sensor has a magnetic flux density generated by the first magnetic body - hereinafter referred to as a first magnetic flux density, a magnetic flux density generated by the second magnetic body - hereinafter referred to as a second magnetic flux density, Hereinafter, the magnetic flux density generated by the first magnetic body and the second magnetic body except the first magnetic body, hereinafter referred to as a third magnetic body, among the plurality of magnetic bodies is referred to as a third magnetic flux density, Measuring the current through a Hall effect from the first magnetic flux density, the second magnetic flux density and the third magnetic flux density,
The sensitivity of the Hall voltage of the Hall sensor is affected by the magnetic flux density provided by the magnetic core,
Wherein the magnetic flux density is generated by the magnetic core by the current flowing through the conductor and is provided to the Hall sensor,
The magnetic flux density is affected by the magnetic permeability of the magnetic core,
Since the saturation Hall voltage of the hall sensor is influenced by the saturation magnetic flux density of the magnetic flux density provided by the magnetic core,
Wherein the sensitivity of the Hall voltage of the Hall sensor and the saturation Hall voltage can be adjusted by controlling a ratio of the first magnetic body and the second magnetic body in the magnetic core.

The method according to claim 1,
Wherein the second magnetic body has a larger permeability than the first magnetic body, the first magnetic body has a larger saturation magnetic flux density than the second magnetic body,
The Hall sensor detects a magnetic flux density generated by the first magnetic body - hereinafter referred to as a first magnetic flux density, and a magnetic flux density generated by the second magnetic body - hereinafter referred to as a second magnetic flux density, from the current flowing in the conductor And measuring the current through the Hall effect from the received first magnetic flux density and the second magnetic flux density,
The second magnetic body has a larger permeability than the first magnetic body and the first magnetic body has a larger saturation magnetic flux density than the second magnetic body,
Wherein the magnetic core formed by stacking the first magnetic body and the second magnetic body has a relatively large magnetic permeability as compared with the magnetic core composed of only the first magnetic body and has a relatively large saturated magnetic flux Current sensor using a laminated magnetic core having a high density.

The method according to claim 6,
Wherein a magnetic permeability and a saturation magnetic flux density of the magnetic core can be adjusted by controlling a ratio of the first magnetic body and the second magnetic body in the magnetic core.

The method according to claim 1,
Wherein the first magnetic body has the largest saturation magnetic flux density among the plurality of magnetic bodies,
Wherein the second magnetic body has the largest magnetic permeability among the plurality of magnetic bodies,
The hall sensor has a magnetic flux density generated by the first magnetic body - hereinafter referred to as a first magnetic flux density, a magnetic flux density generated by the second magnetic body - hereinafter referred to as a second magnetic flux density, Hereinafter, the magnetic flux density generated by the first magnetic body and the second magnetic body except the first magnetic body, hereinafter referred to as a third magnetic body, among the plurality of magnetic bodies is referred to as a third magnetic flux density, Measuring the current through a Hall effect from the first magnetic flux density, the second magnetic flux density and the third magnetic flux density,
Since the first magnetic body has the largest saturation magnetic flux density and the second magnetic body has the largest magnetic permeability,
Wherein a magnetic permeability and a saturation magnetic flux density of the magnetic core can be adjusted by controlling a ratio of the first magnetic body and the second magnetic body in the magnetic core.

9. The method according to any one of claims 1 to 8,
Wherein the first magnetic body is formed of a Si-Fe based material and the second magnetic body is formed of a Ni-Fe based material.