CN117269584B - Current detection module - Google Patents
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- CN117269584B CN117269584B CN202311554908.2A CN202311554908A CN117269584B CN 117269584 B CN117269584 B CN 117269584B CN 202311554908 A CN202311554908 A CN 202311554908A CN 117269584 B CN117269584 B CN 117269584B
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- 239000000758 substrate Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 abstract description 9
- 239000011162 core material Substances 0.000 description 32
- 238000010891 electric arc Methods 0.000 description 24
- 238000010586 diagram Methods 0.000 description 7
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- 229910000859 α-Fe Inorganic materials 0.000 description 5
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- 230000006872 improvement Effects 0.000 description 2
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- 239000000463 material Substances 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
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- 239000000523 sample Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910001289 Manganese-zinc ferrite Inorganic materials 0.000 description 1
- 229910001053 Nickel-zinc ferrite Inorganic materials 0.000 description 1
- JIYIUPFAJUGHNL-UHFFFAOYSA-N [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[O--].[Mn++].[Mn++].[Mn++].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Fe+3].[Zn++].[Zn++] JIYIUPFAJUGHNL-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The application provides a current detection module, include: a magnetic flux collecting ring surrounding the current carrying wire; a winding inductance for detecting an arc current; a magnetic sensor for measuring a direct current; the magnetic focusing ring comprises an air gap; the magnetic focusing ring is provided with a first magnetic core side and a second magnetic core side which are positioned at two sides of the air gap, and the magnetic field directions of the first magnetic core side and the second magnetic core side are parallel to the sensitive direction of the magnetic sensor and are parallel to the axial lead surrounded by the wire winding of the wound inductor; the air gap comprises a first air gap and a second air gap which are arranged in a stacked mode and used for accommodating the magnetic sensor and the winding inductor, the widths of the first air gap and the second air gap are different, and the saturated current used for detecting the arc drawing current and the saturated current used for measuring the direct current are respectively and independently configured.
Description
Technical Field
The present application relates to a current detection module, and more particularly, to a current detection module for detecting arc discharge current and direct current.
Background
In general, when operating at high dc voltages and high currents, it is necessary to perform dc detection and arc discharge current detection. UL1699B is a standard in the united states industry standard for protection against fault arc detection of photovoltaic systems, which specifies that a dc fault circuit breaker must be installed on a line with a dc bus voltage exceeding 80V, and at the same time, the standard requires that the arc fault detection system has a signal indication function, can timely detect an arc of the system and trip, and also requires that the system can test whether the arc detection unit is in normal operation.
The current common scheme for detecting the direct current arc discharge current is as follows: the method is characterized in that an electromagnetic induction type current transformer or a current detection chip is adopted for arc discharge current detection in an alternating current coupling amplifying conditioning mode; for conventional current detection, an open loop current sensor mode is adopted; the combination mode can be realized by being integrated into the equipment in a split mode or combining the two modes into a larger module. The existing sensor scheme needs to be externally added with a signal conditioning circuit, and complicated winding manufacturing technology is needed to be adopted on a large-size magnetic core, so that the sensor is low in integration level, large in size, high in cost and inconvenient for a user to install and use.
Therefore, the existing scheme lacks a current detection module which has small volume, simple manufacturing process and low cost and can integrate direct current detection and arc discharge current detection into a whole.
Disclosure of Invention
In view of this, the present application provides a small, signal to noise ratio, remove complicated magnetic ring wire winding process from, and can be with direct current detection and draw the electric current detection integrated in integrative current detection module to through setting up different air gaps in two kinds of detection probes (wire winding inductance, magnetic sensor) position, thereby realize that two kinds of detection methods dispose saturated current scope alone.
Furthermore, the application provides a current detection module which can integrate direct current detection and a signal conditioning circuit thereof, arc discharge current detection and a signal conditioning circuit thereof into a whole.
The technical scheme provided by the application is as follows:
a current detection module, comprising:
a magnetic flux collecting ring surrounding the current carrying wire;
a winding inductance for detecting an arc current; and, a step of, in the first embodiment,
a magnetic sensor for measuring a direct current;
the magnetic focusing ring comprises an air gap for accommodating the wound inductor and the magnetic sensor;
the magnetic focusing ring is provided with a first magnetic core side and a second magnetic core side which are positioned at two sides of the air gap, the magnetic field direction of the first magnetic core side and the magnetic field direction of the second magnetic core side are parallel to the sensitive direction of the magnetic sensor, and are parallel to the axial lead surrounded by the wire winding of the wound inductor;
the air gap comprises a first air gap and a second air gap which are arranged in a stacked mode, the first air gap is used for accommodating the magnetic sensor, the second air gap is used for accommodating the winding inductor, the widths of the first air gap and the second air gap are different, and the saturated current for detecting the arc discharge current and the saturated current for measuring the direct current are respectively and independently configured.
Further, the first air gap has a first opening length L1, the second air gap has a second opening length L2, wherein,
the value range of the first opening length L1 is as follows: 2-5 mm;
the value range of the second opening length L2 is as follows: 1.5-10 mm.
Further, the open cross-sectional profile of the second air gap is rectangular, trapezoidal, arcuate or profiled.
Further, the first opening length L1 is 2-3.5mm; the second opening length L2 is: 4-6mm.
Further, the length of the winding inductor is 1-4 mm.
Further, the magnetic sensor and the winding inductor are arranged on the upper surface and the lower surface of the substrate, and the distance is 1-5mm.
Further, the magnetic sensor and the winding inductor are arranged on the same surface of the substrate, and the distance is 1-5mm.
Further, the area ratio of the winding inductance section to the magnetic flux collecting ring section is 3% -10%.
Further, the magnetic resistance sensor and the winding inductor are integrated in a module, and a signal conditioning circuit is arranged in the module, the magnetic sensor is a Hall sensor, a magnetic sensor or a fluxgate sensor, and the winding inductor is a patch type non-magnetic core winding inductor, a patch type magnetic core winding inductor or an air core winding inductor.
The solution provided by the present application has the following improvements and advantages over the prior art:
1. the winding inductor is arranged at the air gap of the magnetic gathering ring, has large signal and interference resistance, and has low background noise of the winding inductor and high overall signal-to-noise ratio of arc discharge current detection.
2. The air gaps at the positions of the winding inductor and the magnetic resistance sensor can be set to be different in width, and the saturated current detected by the arc discharge current and the saturated current measured by the direct current can be respectively and independently configured.
3. The magnetic resistance sensor and the winding inductor are integrated in one module, the magnetic resistance sensor is used for measuring direct current, and the winding inductor is used for detecting arc discharge current; the arc discharge current detection adopts a winding inductance as an arc discharge current detection probe, so that a winding process on a current collecting magnetic core is avoided.
4. The direct current measurement and the arc discharge current detection are both internally provided with signal conditioning circuits, direct current and arc discharge current signals can be measured at the same time, the signal conditioning circuits are not required to be added outside the module, and the direct current measurement and the arc discharge current detection can be directly connected into an analog-to-digital converter for sampling.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a current detection module according to a first embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a current detection module according to a second embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a current detection module according to a third embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a current detection module according to a fourth embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a current detection module according to a fifth embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a current detection module according to a sixth embodiment of the present disclosure;
FIG. 7 is a schematic cross-sectional view of a current detection module according to an embodiment of the present disclosure;
fig. 8 is a graph of the arc discharge current output frequency response of the current detection module according to an embodiment of the present application.
Reference numerals:
a magnetic gathering ring (magnetic core) 1, a magnetic sensor 2, a winding inductor 3, an air gap 4 and a substrate 5;
a first core side 11, a second core side 12;
a first air gap 41, a second air gap 42.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Fig. 1 to 6 provide schematic diagrams of current detection modules according to six different embodiments of the present application. The current detection module comprises the following structures: a magnetic gathering ring (magnetic core) 1, a magnetic sensor 2 and a winding inductance 3. The magnetic poly ring (magnetic core) 1 can be ferrite, silicon steel, permalloy, amorphous alloy, metal magnetic powder core, etc. The length of the package size of the magnetic sensor 2 in the X-axis is generally 1 to 4mm, and in one embodiment, the length of the package size of the magnetic sensor 2 in the X-axis is set to 2mm. The main material of the winding inductor 3 can be ceramic or ferrite. The length dimension of the winding inductor 3 can be 1-4 mm, and the section dimension of the winding inductor 3 can be 0.3-9 mm 2 In one embodiment, a 0603 encapsulated ferrite wire wound inductor is selected, and the length, width and height dimensions of the ferrite wire wound inductor are 1.6x0.8x0.8mm. The package size of the winding inductor 3 can be selected from 0402, 0603,0805. Model 1206 or 1210.
The magnetic flux collecting ring 1 encloses current carrying wires (not shown in the figures), said magnetic flux collecting ring 1 comprising an air gap 4. One magnetic flux collecting ring 1 may comprise two air gaps 4 arranged opposite each other. A magnetic sensor 2 and a winding inductance 3 are arranged at the air gap 4 of the magnetic gathering ring 1, wherein the magnetic sensor 2 is used for detecting direct current signals on current carrying conductors passing through the magnetic core, and the winding inductance 3 is used for detecting arc discharge current signals on the current carrying conductors passing through the magnetic core.
The magnetic flux collecting ring 1 is provided with a first magnetic core side 11 and a second magnetic core side 12 which are positioned at two sides of the air gap 4, a magnetic field A is arranged in the first magnetic core side 11, a magnetic field B is arranged in the second magnetic core side 12, and the direction and the size of the magnetic field A are the same as those of the magnetic field B; the magnetic fields A and B are magnetic fields generated by current-carrying conductor currents in the magnetic core, and the magnitudes of the magnetic fields are proportional to the magnitudes of currents passing through the magnetic core.
Particularly, compared with the prior art, the technical scheme of the application has the advantages that two independent air gaps are arranged under one large air gap 4 and are respectively used for placing the magnetic sensor 2 and the winding inductor 3, so that the saturation current of the arc discharge current detection and the saturation current of the direct current measurement can be respectively and independently configured, and the flexibility and convenience of configuration are enhanced. Specifically, as shown in fig. 1, in the technical solution of the present application, the air gap 4 is configured as a first air gap 41 and a second air gap 42 that are stacked, where the first air gap 41 is used for accommodating the magnetic sensor 2, and the second air gap 42 is used for accommodating the wound inductor 3. The first air gap 41 has a first average opening length L1 in the X-axis and the second air gap 42 has a second average opening length L2. The magnetic field E illustrated in fig. 1 is the magnetic field at the first air gap 41 and the magnetic field F is the magnetic field at the second air gap 42. And the directions of the magnetic fields E and F are the same as those of the magnetic fields A and B. The magnetic field magnitudes of the magnetic fields E, F are proportional to the magnitudes of the magnetic fields A, B. The magnetic field E has a magnetic field magnitude inversely proportional to the length L1 of the first air gap 41 and the magnetic field F has a magnetic field magnitude inversely proportional to the length L2 of the second air gap 42. The first average opening length L1 and the second average opening length L2 may be set to be different, so that a saturation current for detecting the arc discharge current and a saturation current for measuring the direct current are respectively configured separately. Further, the opening cross sections of the first air gap and the second air gap may be different, as shown in the figure, the opening cross section of the first air gap 41 may be rectangular, and the opening cross section of the second air gap 42 may be rectangular, trapezoidal, arc-shaped or special-shaped, so as to further improve the flexibility, convenience, sensitivity and accuracy of detection.
In the scheme of the application, the length ranges of the first air gap and the corresponding magnetic sensor and the length ranges of the second air gap and the corresponding winding inductor are further optimally designed, so that the sensitivity and the accuracy of detection are improved. The first opening length L1 of the first air gap 41 is adjusted according to the maximum dc current, and is generally 2-5 mm, preferably 2.8mm; correspondingly, the length of the packaging size of the magnetic sensor on the X axis is generally 1-4 mm, preferably 2mm. The first opening length L2 of the second air gap 42 is in the range of 1.5-10 mm, preferably 6mm, and the corresponding length dimension of the winding inductance may be 1-4 mm. The first opening length L2 can be adjusted according to the winding inductance material, the arc discharge current and the maximum direct current.
In the scheme of the application, the cross section of the magnetic core and the cross section of the winding inductor are further optimally designed, so that a magnetic field with a proper proportion passes through the winding inductor. The ratio of the cross-sectional area of the first magnetic core side 11 to the cross-sectional area of the wound inductance is: 3% -10%. The section size of the winding inductor can be 0.3-9 square millimeters.
The magnetic field direction of the magnetic field a of the first magnetic core side 11 and the magnetic field direction of the magnetic field B of the second magnetic core side 12 are parallel to the sensitive direction C of the magnetic sensor and the axis D surrounded by the wire winding of the wound inductor.
As shown in fig. 7, the first air gap 41 has a width L4 in the Y-axis direction, and the second air gap 42 has a width L5 in the Y-axis direction, and the dimensions of L4 need to match the measurement range of the magnetic sensor, so that the sensor is in a suitable magnetic field measurement range; to ensure the current detection accuracy of the magnetic sensor, a sufficient thickness is required to bring the vicinity of the sensor into a uniform magnetic field range. The L5 is used for adjusting the magnetic field intensity range of the magnetic field of the winding inductance area to be in a proper sensitivity range. In the scheme, the thickness of the L5 is set smaller, and the ratio range of the L4 to the L5 is 3:1-5:1.
The magnetic sensor for detecting the direct current signal is a magnetic induction chip and can comprise, but is not limited to, a Hall sensor, a magnetic resistance sensor and a fluxgate sensor. The magnetic core material may include, but is not limited to, metal soft magnetic (pure iron, silicon steel, permalloy, metal soft magnetic powder core), ferrite soft magnetic (manganese zinc ferrite, nickel zinc ferrite, etc.), amorphous and nanocrystalline soft magnetic.
The magnetic sensor for detecting the arc discharge current signal is a winding inductance, and can include, but is not limited to, a patch type non-magnetic core winding inductance, a patch type magnetic core winding inductance and an air core winding inductance.
The direct current measurement signal conditioning circuit adopts an ASIC chip, and is internally provided with a reference adjustment, a sensitivity adjustment and a temperature compensation circuit. The arc discharge current detection conditioning circuit adopts an integral amplifying circuit and a filtering amplifying circuit.
As shown in fig. 8, the technical scheme described in the application is adopted, and conventional direct current measurement and arc discharge current detection are performed simultaneously, and a current sensor with an arc discharge signal conditioning circuit is built in. The arc-striking current detection shown in fig. 8 has a flat amplitude-frequency curve in the frequency range of 10 k-100 khz, has a high signal-to-noise ratio, is not easy to magnetically saturate, and can still detect an arc-striking current signal superimposed on a direct-current saturated current when the direct-current output is saturated.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A current detection module, comprising:
a magnetic flux collecting ring surrounding the current carrying wire;
a winding inductance for detecting an arc current; and, a step of, in the first embodiment,
a magnetic sensor for measuring a direct current;
it is characterized in that the method comprises the steps of,
the magnetic focusing ring comprises an air gap for accommodating the wound inductor and the magnetic sensor;
the magnetic focusing ring is provided with a first magnetic core side and a second magnetic core side which are positioned at two sides of the air gap, the magnetic field direction of the first magnetic core side and the magnetic field direction of the second magnetic core side are parallel to the sensitive direction of the magnetic sensor, and are parallel to the axial lead surrounded by the wire winding of the wire winding inductor;
the air gap comprises a first air gap and a second air gap which are arranged in a stacked mode, the first air gap is used for accommodating the magnetic sensor, the second air gap is used for accommodating the winding inductor, the widths of the first air gap and the second air gap are different, and the first air gap and the second air gap are used for independently configuring the arc-pulling saturation current detected by the winding inductor and the direct-current saturation current detected by the magnetic sensor respectively;
the first air gap has a first opening length L1, the second air gap has a second opening length L2, wherein,
the length L1 of the first opening is 2-3.5mm; the second opening length L2 is: 4-6mm;
the first air gap and the second air gap are different in shape;
the length of the winding inductor is 1-4 mm.
2. The current detection module according to claim 1, wherein the open cross-sectional profile of the second air gap is rectangular, trapezoidal, arcuate or profiled.
3. The current detection module according to claim 1, wherein the magnetic sensor and the winding inductor are respectively disposed on the upper and lower surfaces of the substrate, and the distance is 1-5mm.
4. The current detection module according to claim 1, wherein the magnetic sensor and the winding inductor are disposed on the same surface of the substrate with a pitch of 1-5mm.
5. The current detection module of claim 4, wherein an area ratio of the wound inductance section to the poly ring section is 3% -10%.
6. The current detection module of claim 1, wherein the magnetic sensor and the wound inductor are integrated in a single module and each incorporates a signal conditioning circuit.
7. The current detection module of claim 1, wherein the magnetic sensor is a hall sensor or a fluxgate sensor, and the wound inductor is a patch-type coreless wound inductor, or an air core wound inductor.
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| CN202311554908.2A CN117269584B (en) | 2023-11-21 | 2023-11-21 | Current detection module |
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