CN211905494U - High-precision pincerlike current sensor - Google Patents
High-precision pincerlike current sensor Download PDFInfo
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- CN211905494U CN211905494U CN202020233382.3U CN202020233382U CN211905494U CN 211905494 U CN211905494 U CN 211905494U CN 202020233382 U CN202020233382 U CN 202020233382U CN 211905494 U CN211905494 U CN 211905494U
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Abstract
The utility model provides a high-precision pincerlike current sensor, which comprises an iron core box (1) and a circuit box (2), wherein the iron core box (1) is electrically connected with the circuit box (2), the iron core box (1) comprises a shell and a hollow cylinder, one end of the hollow cylinder is fixedly connected with the shell, and a groove is formed between the outer surface of the hollow cylinder and the inner surface of the shell, the current sensor comprises an iron core (10), the iron core (10) is sleeved on the outer surface of the hollow cylinder, and is positioned in the groove, a zero detection winding (8) and a compensation winding (9) are wound on the iron core (10), be equipped with detection circuitry (3), amplifier circuit (4) and regulating circuit (5) in circuit box (2), the utility model has the advantages of, adopt this kind of structure, can measure the size of electric current accurately.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to a high accuracy pincerlike current sensor belongs to the current detection equipment field.
[ background of the invention ]
At present, a common current sensor is an electromagnetic current sensor, which detects current by using a faraday's law of electromagnetic induction, generates induced electromotive force by a change in magnetic flux, and generates induced current in a closed coil.
Traditional pincerlike current sensor includes the iron core, and the winding has the detection winding on the iron core, and wherein, the iron core is the annular, and the circular telegram wire passes the iron core, because electromagnetic induction produces the electric current on the detection winding, and specific numerical value is measured through the ampere meter to the electric current, but, the induced electromotive force that the circular telegram wire produced partly turns into exciting current for magnetize the iron core, make the current data error that the current sensor measured appear, influence current sensor's the degree of accuracy.
[ Utility model ] content
The utility model aims to solve the technical problem that a high accuracy pincerlike current sensor is provided for current sensor can record more accurate data.
For solving the technical problem, the utility model discloses high accuracy pincerlike current sensor's preferred structure includes iron core box and circuit box, be connected for the electricity between iron core box and the circuit box, and the two relative separation, the iron core box includes shell and hollow cylinder, be fixed connection between hollow cylinder's one end and the shell, and form the recess between the surface of hollow cylinder's surface and the internal surface of shell, current sensor includes the iron core, the iron core cover is established on hollow cylinder's the surface, and be located the recess, be equipped with detection circuitry, amplifier circuit and regulating circuit in the circuit box, examine to be connected for the electricity between zero winding, detection circuitry, amplifier circuit, regulating circuit and the compensation winding, and form closed loop in proper order.
After the structure is adopted, firstly, the pincerlike current sensor comprises an iron core box and a circuit box, the iron core box and the circuit box are electrically connected and are relatively separated, when the current sensor is used, circuit elements arranged in the circuit box separate the circuit elements from the iron core box, so that the volume of the iron core box is reduced, the current sensor is more convenient to use, meanwhile, more circuit elements with larger volume can be arranged in the circuit box, so that the structure of the current sensor is more optimized, the iron core box comprises a shell and a hollow cylinder, one end of the hollow cylinder is fixedly connected with the shell, a groove is formed between the outer surface of the hollow cylinder and the inner surface of the shell, the current sensor comprises an iron core, the iron core is sleeved on the outer surface of the hollow cylinder and is positioned in the groove, so that the iron core can be positioned relative to the iron core box, the iron core is wound with a zero detection winding and a compensation winding, the zero detection winding is used for forming induced current, the compensation winding is used for reducing errors, a detection circuit, an amplification circuit and an adjusting circuit are arranged in the circuit box, the zero detection winding, the detection circuit, the amplification circuit, the adjusting circuit and the compensation winding are electrically connected and form a closed loop in sequence, and the induced current formed by the zero detection winding can be amplified and flows into the compensation winding.
Secondly, in the prior art, a current-carrying lead is inserted into the iron core, and a part of induced electromotive force generated by the current-carrying lead is converted into exciting current for magnetizing the iron core, so that the current measured by the current sensor is reduced.
Based on the structure, the detection circuit is used for detecting the current flowing into the current sensor, the adjusting circuit controls the amplification factor of the amplifying circuit, so that the current is increased and flows into the compensation winding, the current generates magnetic flux through the compensation winding, the magnetic flux is offset with the magnetic flux generated by the electrified lead, and the iron core realizes magnetic potential balance.
Based on the structure, according to the electromagnetic induction law, the iron core has to have magnetic flux to enable the zero detection winding of the current sensor to generate current, so that the iron core is not in a zero magnetic flux state and can only be close to the zero magnetic flux state, the regulating circuit dynamically adjusts the current flowing into the compensation winding by comparing the difference value between the detected current value and the allowed current value, the magnetic flux of the compensation winding is dynamically changed relative to the magnetic flux generated by the electrified lead, and the iron core is enabled to reach a dynamic magnetomotive force balance state.
Preferably, the detection circuit includes a current detector for detecting a current and a voltage detector for detecting a voltage.
Preferably, the amplifying circuit comprises an amplifier.
Preferably, the regulating circuit comprises a controller and a comparator, and the controller and the comparator, the amplifier, the current detector and the voltage detector are all electrically connected.
Preferably, the regulating circuit comprises a controller and a comparator, and the controller and the comparator, the amplifier, the current detector and the voltage detector are all electrically connected.
Preferably, the iron core box is provided with a wiring port for connecting the zero detection winding and the compensation winding.
Preferably, the iron core box and the circuit box are connected through a wire, connecting terminals are arranged at two ends of the wire and are used for being connected with the wiring port.
Preferably, a built-in power supply is arranged in the circuit box and used for supplying power to the detection circuit, the amplification circuit and the regulating circuit.
Preferably, the housing of the iron core box is a shielding shell for shielding a magnetic field.
Preferably, a load resistor is connected between the regulating circuit and the compensation winding.
These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.
[ description of the drawings ]
The invention will be described in further detail with reference to the accompanying drawings, in which:
fig. 1 is a schematic diagram of a pincer-shaped current sensor according to the present invention;
FIG. 2 is a schematic diagram of an iron core box of the pincer-shaped current sensor of the present invention;
FIG. 3 is a schematic diagram of the circuit connections of the components of the current sensor of the present invention;
FIG. 4 is a schematic diagram of a detection circuit in the clamp-on current sensor of the present invention;
FIG. 5 is a schematic diagram of a regulating circuit in the pincer-shaped current sensor according to the present invention;
fig. 6 is a schematic diagram of the circuit connection of the controller portion of the clamp-type current sensor according to the present invention.
[ detailed description ] embodiments
The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the embodiment, other embodiments obtained by those skilled in the art without any creative work belong to the protection scope of the present invention.
In the following description, the terms "inside", "outside", "upper", "lower", "left", "right", and the like, which indicate orientations or positional relationships, are used to indicate orientations or positional relationships based on the drawings, and are only used for convenience in describing embodiments and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, fig. 2 and fig. 3, the utility model discloses pincerlike current sensor's preferred structure includes iron core box 1 and circuit box 2, be connected for the electricity between iron core box 1 and the circuit box 2, and the two relative separation, iron core box 1 includes shell and hollow cylinder, be fixed connection between hollow cylinder's one end and the shell, and form the recess between the surface of hollow cylinder's surface and the internal surface of shell, current sensor includes iron core 10, iron core 10 cover is established on hollow cylinder's the surface, and be located the recess, be equipped with detection circuitry 3, amplifier circuit 4 and regulating circuit 5 in the circuit box 2, examine to be connected for the electricity between zero winding 8, detection circuitry 3, amplifier circuit 4, regulating circuit 5 and the compensation winding 9, and form closed circuit in proper order.
After the structure is adopted, firstly, the pincerlike current sensor comprises an iron core box 1 and a circuit box 2, the iron core box 1 and the circuit box 2 are electrically connected and relatively separated, when the current sensor is used, circuit elements arranged in the circuit box 2 separate the circuit elements from the iron core box 1, so that the volume of the iron core box 1 is reduced, the current sensor is more convenient to use, meanwhile, a larger number of circuit elements with larger volume can be arranged in the circuit box 2, so that the structure of the current sensor is more optimized, the iron core box 1 comprises a shell and a hollow cylinder, one end of the hollow cylinder is fixedly connected with the shell, a groove is formed between the outer surface of the hollow cylinder and the inner surface of the shell, the current sensor comprises an iron core 10, the iron core 10 is sleeved on the outer surface of the hollow cylinder and is positioned in the groove, so that the iron core 10 can be positioned relative to the iron core box 1, winding has on the iron core 10 and examines zero winding 8 and compensating winding 9, and the winding 8 of examining zero is used for forming induced-current, and compensating winding 9 is used for reducing the error, be equipped with detection circuitry 3, amplifier circuit 4 and regulating circuit 5 in the circuit box 2, examine for electric connection between zero winding 8, detection circuitry 3, amplifier circuit 4, regulating circuit 5 and the compensating winding 9, and form closed loop in proper order for the induced-current that the winding 8 of examining zero formed can enlarge and flow into in the compensating winding 9.
Secondly, in the prior art, a current-carrying lead is inserted into the iron core 10, and a part of induced electromotive force generated by the current-carrying lead is converted into excitation current for magnetizing the iron core 10, so that the current measured by the current sensor is reduced.
Based on the structure, the detection circuit 3 is used for detecting the current flowing into the current sensor, the adjusting circuit 5 controls the amplification factor of the amplifying circuit 4, so that the current is increased and flows into the compensation winding 9, the current generates magnetic flux through the compensation winding 9, the magnetic flux is offset with the magnetic flux generated by the electrified conducting wire, and the iron core 10 realizes magnetic potential balance.
Based on the above structure, according to the law of electromagnetic induction, the zero detection winding 8 of the current sensor must have magnetic flux in the iron core 10 to generate current, so that the iron core 10 is not in the zero magnetic flux state but only can be close to the zero magnetic flux state, the adjusting circuit 5 dynamically adjusts the magnitude of the current flowing into the compensation winding 9 by comparing the difference value between the detected current value and the allowed current value, so that the magnetic flux of the compensation winding 9 is dynamically changed relative to the magnetic flux generated by the energized conductor, and the iron core 10 achieves a dynamic magnetomotive force balance state.
In order to make current sensor can measure current value and voltage value, as shown in fig. 4, the utility model discloses preferred detection circuitry 3 is including the current detector who is used for measuring the electric current and the voltage detector who is used for measuring voltage, when test current sensor's precision, penetrates the circular telegram wire of known electric current size in the iron core 10, calculates the electric current size of current sensor under ideal state according to checking zero winding 8's the number of turns, observes current detector and voltage detector, reachs voltage detector's electric current actual value and voltage actual value.
In order to make the electric current increase that flows in compensation winding 9, the utility model discloses preferred amplifier circuit 4 includes the amplifier, and the amplifier is used for will examining the electric current amplification in zero winding 8, carries out current-voltage's conversion simultaneously for there is sufficient electric current to flow in compensation winding 9, and then makes compensation winding 9 can produce sufficient magnetic flux, and can offset the magnetic flux that the circular telegram wire produced, reduces current sensor's detection error.
In order to make current sensor be in dynamic magnetic potential balanced state, as shown in fig. 5 and fig. 6, the utility model discloses preferred regulating circuit 5 includes controller 6 and comparator, and be the electricity between controller 6 and comparator, amplifier, current detector and the voltage detector and be connected, the magnification of amplifier can be controlled to controller 6 for the electric current increase in compensation winding 9, when the electric current that current detector detected and the current value that allows appear the deviation, the comparator compares the size of the two, and adjust in real time through controller 6, guarantee that the current value is in the error band that allows, and then make current sensor be in relative dynamic magnetic potential balanced state.
In order to optimize the structure, the utility model discloses the preferred number of turns of checking zero winding 8 is more than the number of turns of compensation winding 9, the utility model discloses the preferred number of turns of checking zero winding 8 is 1000 circles, and compensation winding 9 is 500 circles, and the current ratio in the electric current in the electric wire and the current sensor under the ideal state is inversely proportional to the ratio of the number of turns of the two, when the number of turns of checking zero winding 8 is more promptly, the current in the checking zero winding 8 is less, guarantees the error promptly in the allowed range, makes the current that flows in the checking zero winding 8 enough little again, can record through current detector and voltage detector.
For the convenience of examining zero winding 8 and compensating winding 9 and connecting, the utility model discloses be equipped with on the preferred iron core box 1 and be used for with the wiring mouth that links to each other of examining zero winding 8 and compensating winding 9, examine zero winding 8 and compensating winding 9 and wind on the iron core, its both ends link to each other with the wiring mouth, and external connection line is direct to be connected and dismantles through the wiring mouth for it is more convenient when connecting to examine zero winding 8 and compensating winding 9.
In order to make the connection more convenient, the utility model discloses it is connected to adopt the wire between preferred iron core box 1 and the circuit box 2, the both ends of wire all are equipped with connecting terminal, connecting terminal is used for linking to each other with the wiring mouth, through the mode that binding post and wiring are connected for can be connected more conveniently and dismantle when connecting wire and iron core box 1 are connected with circuit box 2.
In order to make the circuit in the circuit box 2 have the power supply, the utility model discloses be equipped with built-in power supply in the preferred circuit box 2, built-in power supply is used for the power supply of detection circuitry 3, amplifier circuit 4 and regulating circuit 5 for circuit in the circuit box 2 has the external power supply, guarantees basic circuit's operation.
In order to improve pincerlike current sensor's precision, the utility model discloses the shell of preferred iron core box 1 is for being used for the shielding casing in shielding magnetic field, and iron core 10 is located iron core box 1, prevents through shielding casing that external magnetic field from disturbing iron core 10 in the shielding casing to make the sensor measurement more accurate.
In order to make the normal work of guaranteeing pincerlike current sensor, the utility model discloses be connected with load resistance 7 between preferred regulating circuit 5 and the compensation winding 9, load resistance 7 is total load resistance in the closed circuit, and its load includes the ampere meter of measuring current, the voltmeter of measuring voltage, prevents the additional resistance of short circuit and the external load that links to each other with pincerlike current sensor etc..
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that the present invention includes but is not limited to the contents described in the drawings and the above specific embodiments. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. A high accuracy pincerlike current sensor which characterized in that: the current sensor comprises an iron core box (1) and a circuit box (2), wherein the iron core box (1) and the circuit box (2) are electrically connected and are separated from each other, the iron core box (1) comprises a shell and a hollow cylinder, one end of the hollow cylinder is fixedly connected with the shell, a groove is formed between the outer surface of the hollow cylinder and the inner surface of the shell, the current sensor comprises an iron core (10), the iron core (10) is sleeved on the outer surface of the hollow cylinder and is positioned in the groove, a zero detection winding (8) and a compensation winding (9) are wound on the iron core (10), a detection circuit (3), an amplification circuit (4) and an adjustment circuit (5) are arranged in the circuit box (2), the zero detection winding (8), the detection circuit (3), the amplification circuit (4), the adjustment circuit (5) and the compensation winding (9) are electrically connected, and in turn form a closed loop.
2. A high accuracy clamp-on current sensor as claimed in claim 1 wherein: the detection circuit (3) comprises a current detector for detecting current and a voltage detector for detecting voltage.
3. A high accuracy clamp-on current sensor as claimed in claim 2 wherein: the amplifying circuit (4) comprises an amplifier.
4. A high accuracy clamp current sensor in accordance with claim 3 wherein: the regulating circuit (5) comprises a controller (6) and a comparator, and the controller (6) is electrically connected with the comparator, the amplifier, the current detector and the voltage detector.
5. A high accuracy clamp-on current sensor as claimed in claim 1 wherein: the number of turns of the zero detection winding (8) is more than that of the number of turns of the compensation winding (9).
6. A high accuracy clamp-on current sensor as claimed in claim 1 wherein: the iron core box (1) is provided with a wiring port which is connected with the zero detection winding (8) and the compensation winding (9).
7. A high accuracy clamp-on current sensor according to claim 6 wherein: the iron core box (1) and the circuit box (2) are connected through a lead, connecting terminals are arranged at two ends of the lead and are used for being connected with a wiring port.
8. A high accuracy clamp-on current sensor as claimed in claim 1 wherein: the circuit box (2) is internally provided with a built-in power supply which is used for supplying power to the detection circuit (3), the amplification circuit (4) and the adjusting circuit (5).
9. A high accuracy clamp-on current sensor as claimed in claim 1 wherein: the shell of the iron core box (1) is a shielding shell for shielding a magnetic field.
10. A high accuracy clamp-on current sensor as claimed in claim 1 wherein: and a load resistor (7) is connected between the regulating circuit (5) and the compensation winding (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020233382.3U CN211905494U (en) | 2020-02-28 | 2020-02-28 | High-precision pincerlike current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020233382.3U CN211905494U (en) | 2020-02-28 | 2020-02-28 | High-precision pincerlike current sensor |
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| Publication Number | Publication Date |
|---|---|
| CN211905494U true CN211905494U (en) | 2020-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020233382.3U Active CN211905494U (en) | 2020-02-28 | 2020-02-28 | High-precision pincerlike current sensor |
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| Country | Link |
|---|---|
| CN (1) | CN211905494U (en) |
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- 2020-02-28 CN CN202020233382.3U patent/CN211905494U/en active Active
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