CN217034077U - Large current measuring device based on high-precision current sensor and shunt - Google Patents
Large current measuring device based on high-precision current sensor and shunt Download PDFInfo
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- CN217034077U CN217034077U CN202123153202.4U CN202123153202U CN217034077U CN 217034077 U CN217034077 U CN 217034077U CN 202123153202 U CN202123153202 U CN 202123153202U CN 217034077 U CN217034077 U CN 217034077U
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Abstract
The utility model discloses a high-current measuring device based on a high-precision current sensor and a shunt, which is used for accurately measuring high current. The utility model discloses a high-current measuring device based on a high-precision current sensor and a shunt, which is used for shunting current input by the shunt so that the high-precision current sensor can accurately measure the current on the low-current side of the shunt and then calculate the actually input high current through the shunt at a constant shunt ratio.
Description
Technical Field
The utility model belongs to the technical field of current sensors, and particularly relates to a high-current measuring device based on a high-precision current sensor and a current divider.
Background
The current sensor is a detection device which can sense the information of the current to be detected and convert the sensed information into an electric signal meeting certain standards or other information in required forms according to a certain rule for output so as to meet the requirements of information transmission, processing, storage, display, recording, control and the like.
However, the existing current sensor has low measuring range and low precision, especially the detection precision for large current.
Therefore, the above problems are further improved.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide a high-current measuring device composed of a high-precision current sensor and a shunt, which is used for shunting current input by the shunt so that the high-precision current sensor can accurately measure the current on the low-current side of the shunt, and then the shunt is used for calculating the actually input high current at a constant shunt ratio.
The utility model also aims to provide a high-current measuring device based on the high-precision current sensor and the shunt, which has the advantages of high precision, convenience in use, stable structure and the like.
In order to achieve the above object, the present invention provides a high current measuring device based on a high precision current sensor and a current divider, which is used for accurately measuring a high current, and comprises the high precision current sensor and the current divider, wherein:
the shunt comprises a first wiring screw hole, a connecting piece and a second wiring screw hole, and the first wiring screw hole and the second wiring screw hole are positioned on two sides of the connecting piece;
the high-precision current sensor comprises a probe, a zero magnetic flux detector, an amplification feedback circuit and an output circuit, wherein the probe is positioned on one side of the connecting piece where small current (relative) is generated, the output end of the probe is electrically connected with the input end of the zero magnetic flux detector, the output end of the zero magnetic flux detector is electrically connected with the input end of the amplification feedback circuit, and the output end of the amplification feedback circuit is electrically connected with the input end of the output circuit.
As a further preferable technical solution of the above technical solution, the probe includes a magnetic core T1, a magnetic core T2, a magnetic core T3, a winding coil N1, a winding coil N2, a winding coil N3, and a winding coil N4, wherein:
the winding coil N1 is mounted on the core T1, the winding coil N2 is mounted on the core T2, the winding coil N3 and the winding coil N4 are both disposed on the core T1 and the core T2, and the winding coil N3 and the winding coil N4 are common windings of the core T1 and the core T2;
the magnetic core T1 and the magnetic core T2 are both electrically connected with the input end of the zero magnetic flux detector.
As a further preferred technical solution of the above technical solution, the amplifying feedback circuit includes an operational amplifier Z, a first feedback device and a second feedback device, and the operational amplifier Z is electrically connected to the first feedback device and the second feedback device, respectively, where:
the first feedback device comprises a resistor R1 and a capacitor C1, the output end of the zero magnetic flux detector is electrically connected with the negative input end of the operational amplifier Z, the positive input end of the operational amplifier Z is grounded, and one path of the output end of the zero magnetic flux detector is electrically connected with the connection end of the winding coil N4 through a resistor R1 and a capacitor C1 in sequence;
the second feedback device comprises a resistor R2 and a capacitor C2, and two paths of output ends of the zero magnetic flux detector are electrically connected with the input end of the winding coil N3 sequentially through a resistor R2 and a capacitor C2.
As a further preferable embodiment of the above technical solution, the output circuit includes a sampling resistor R3, and the output terminal of the winding coil N3 is grounded through the sampling resistor R3.
As a further preferable embodiment of the above-mentioned technical solution, the core T1 and the core T2 are symmetrically disposed, the winding coil N1 and the winding coil N2 have the same number of turns and are wound in opposite directions, the winding coil N3 is a compensation coil and the winding coil N4 is a feedback coil.
Drawings
Fig. 1 is a schematic structural diagram of a high-current measuring device based on a high-precision current sensor and a current divider according to the present invention.
The reference numerals include: 10. a flow divider; 11. a first wiring screw hole; 12. a second wiring screw hole; 13. a connecting member; 20. a high-precision current sensor; u1, zero flux detector.
Detailed Description
The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments described below are by way of example only, and other obvious variations will occur to those skilled in the art. The underlying principles of the utility model, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.
The utility model discloses a high-current measuring device based on a high-precision current sensor and a shunt, and the specific embodiment of the utility model is further described by combining the preferred embodiment.
In the embodiments of the present invention, those skilled in the art note that the screw holes and the like related to the present invention can be regarded as the prior art.
Preferred embodiments.
The utility model discloses a high-current measuring device based on a high-precision current sensor and a current divider, which is used for accurately measuring high current and comprises a high-precision current sensor 20 and a current divider 10, wherein:
the shunt 10 comprises a first wiring screw hole 11, a connecting piece 13 and a second wiring screw hole 12, wherein the first wiring screw hole 11 and the second wiring screw hole 12 are positioned at two sides of the connecting piece 13;
the high-precision current sensor 20 comprises a probe, a zero magnetic flux detector U1, an amplification feedback circuit and an output circuit, wherein the probe is positioned on one side where the connecting piece generates a small current (relative) and the output end of the probe is electrically connected with the input end of the zero magnetic flux detector U1, the output end of the zero magnetic flux detector U1 is electrically connected with the input end of the amplification feedback circuit, and the output end of the amplification feedback circuit is electrically connected with the input end of the output circuit.
Specifically, the probe comprises a magnetic core T1, a magnetic core T2, a magnetic core T3, a winding coil N1, a winding coil N2, a winding coil N3 and a winding coil N4, wherein:
the winding coil N1 is mounted on the magnetic core T1, the winding coil N2 is mounted on the magnetic core T2, the winding coil N3 and the winding coil N4 are both disposed on the magnetic core T1 and the magnetic core T2, and the winding coil N3 and the winding coil N4 are common windings of the magnetic core T1 and the magnetic core T2;
the magnetic core T1 and the magnetic core T2 are both electrically connected with the input end of the zero magnetic flux detector U1.
More specifically, the amplifying feedback circuit includes an operational amplifier Z, a first feedback device and a second feedback device, where the operational amplifier Z is electrically connected to the first feedback device and the second feedback device, respectively, and where:
the first feedback device comprises a resistor R1 and a capacitor C1, the output end of the zero magnetic flux detector U1 is electrically connected with the negative input end of the operational amplifier Z, the positive input end of the operational amplifier Z is grounded, and one path of the output end of the zero magnetic flux detector U1 is electrically connected with the connecting end of the winding coil N4 sequentially through a resistor R1 and a capacitor C1;
the second feedback device comprises a resistor R2 and a capacitor C2, and two paths of output ends of the zero magnetic flux detector U1 are electrically connected with the input end of the winding coil N3 sequentially through the resistor R2 and the capacitor C2.
Further, the output circuit comprises a sampling resistor R3, and the output end of the winding coil N3 is grounded through the sampling resistor R3.
Still further, the core T1 and the core T2 are symmetrically disposed, the winding coil N1 and the winding coil N2 have the same number of turns and opposite winding directions, the winding coil N3 is a compensation coil and the winding coil N4 is a feedback coil.
The principle of the utility model is as follows:
the utility model mainly comprises a high-precision current sensor and a current divider, wherein the high-precision current sensor comprises a probe, a zero magnetic flux detector, an amplifying circuit and an output circuit. The probe comprises three magnetic cores and four winding coils, wherein T1 and T2 are magnetic cores with the same magnetic quantity and materials, T3 is a common inductance magnetic core, N1 and N2 are windings of T1 and T2 respectively, N3 and N4 are windings common to T1 and T2, N4 is a feedback coil, N4 is a compensation coil, and a measured current Ip is connected with all the magnetic cores through a primary coil Np (virtual coil) and is connected as shown in figure 1. The zero flux detector is used to detect the dc current signal, which is directly induced by the feedback coil N4. The shunt is mainly composed of a low-resistance constant-shunt-ratio copper material (a connecting piece) and a wiring screw hole.
As shown in FIG. 1, the double detection coils are respectively arranged on two symmetrical magnetic cores made of the same material, the number of turns is equal, the winding directions are opposite, and the modulation triangular wave of kHz magnitude simultaneously excites the two detection coils to generate magnetizing current. The wire of the current to be measured passes through the two detection magnetic cores to form a primary coil, when the current flowing through the primary coil changes, magnetic flux changes are generated on the two detection magnetic cores, so that the magnetic flux of one of the two detection magnetic cores is increased, the magnetic flux of the other detection magnetic core is decreased, according to the nonlinear characteristic of the magnetic core material, the signal difference of the magnetizing currents of the two coils changes along with the change of the current to be measured flowing through the primary coil, and according to the signal difference, a zero magnetic flux detector is designed to detect the signal difference of the two magnetizing currents, the value is subjected to feedback amplification to generate a compensation current to flow through the compensation coil, and the compensation coil is wound on the two detection magnetic cores, so that magnetic fluxes with equal magnitude and opposite directions are generated on the two magnetic cores to counteract the magnetic flux change caused by the primary current. Therefore, the magnetic fluxes in the two magnetic cores can be balanced, the number of turns of the current to be measured is equal to that of the compensating current, and the compensating current value is measured through the output resistance value, namely the current value on the low current side of the shunt is obtained.
The utility model has the advantages that:
1. the measuring range is large (alternating current and direct current);
2. the precision is high, the linearity is high, the compensation effect is obvious, the anti-interference capability is strong, and the reliability is high;
3. measuring large current by a method for measuring small current;
4. the cost is low.
It should be noted that the screw holes and other technical features related to the present invention patent application can be regarded as the prior art, and the specific structure, the operation principle, the control mode and the spatial arrangement mode of the technical features may be selected conventionally in the field, and should not be regarded as the utility model point of the present invention patent, and the present invention patent is not further detailed.
It will be apparent to those skilled in the art that modifications and equivalents may be made in the embodiments and/or portions thereof without departing from the spirit and scope of the present invention.
Claims (5)
1. The utility model provides a heavy current measuring device based on high accuracy current sensor constitutes with the shunt for carry out the precision measurement to heavy current, its characterized in that includes high accuracy current sensor and shunt, wherein:
the shunt comprises a first wiring screw hole, a connecting piece and a second wiring screw hole, wherein the first wiring screw hole and the second wiring screw hole are positioned on two sides of the connecting piece;
the high-precision current sensor comprises a probe, a zero magnetic flux detector, an amplification feedback circuit and an output circuit, wherein the probe is positioned on one side of the connecting piece for generating small current, the output end of the probe is electrically connected with the input end of the zero magnetic flux detector, the output end of the zero magnetic flux detector is electrically connected with the input end of the amplification feedback circuit, and the output end of the amplification feedback circuit is electrically connected with the input end of the output circuit.
2. The high-precision current sensor and shunt-based large-current measuring device as claimed in claim 1, wherein the probe comprises a magnetic core T1, a magnetic core T2, a magnetic core T3, a winding coil N1, a winding coil N2, a winding coil N3 and a winding coil N4, wherein:
the winding coil N1 is mounted on the core T1, the winding coil N2 is mounted on the core T2, the winding coil N3 and the winding coil N4 are both disposed on the core T1 and the core T2, and the winding coil N3 and the winding coil N4 are common windings of the core T1 and the core T2;
the magnetic core T1 and the magnetic core T2 are both electrically connected with the input end of the zero magnetic flux detector.
3. The high-current measuring device based on the high-precision current sensor and the current divider as claimed in claim 2, wherein the amplifying feedback circuit comprises an operational amplifier Z, a first feedback device and a second feedback device, the operational amplifier Z is electrically connected to the first feedback device and the second feedback device, respectively, and wherein:
the first feedback device comprises a resistor R1 and a capacitor C1, the output end of the zero magnetic flux detector is electrically connected with the negative input end of the operational amplifier Z, the positive input end of the operational amplifier Z is grounded, and one path of the output end of the zero magnetic flux detector is electrically connected with the connection end of the winding coil N4 through a resistor R1 and a capacitor C1 in sequence;
the second feedback device comprises a resistor R2 and a capacitor C2, and two paths of output ends of the zero magnetic flux detector are electrically connected with the input end of the winding coil N3 sequentially through a resistor R2 and a capacitor C2.
4. A high-current measuring device based on a high-precision current sensor and a current divider as claimed in claim 3, wherein the output circuit comprises a sampling resistor R3, and the output end of the winding coil N3 is grounded through the sampling resistor R3.
5. A high-current measuring device based on high-precision current sensor and shunt according to claim 4, characterized in that said magnetic core T1 and said magnetic core T2 are symmetrically arranged, said winding coil N1 and said winding coil N2 have the same number of turns and opposite winding directions, said winding coil N3 is a compensation coil and said winding coil N4 is a feedback coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123153202.4U CN217034077U (en) | 2021-12-15 | 2021-12-15 | Large current measuring device based on high-precision current sensor and shunt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123153202.4U CN217034077U (en) | 2021-12-15 | 2021-12-15 | Large current measuring device based on high-precision current sensor and shunt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217034077U true CN217034077U (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123153202.4U Active CN217034077U (en) | 2021-12-15 | 2021-12-15 | Large current measuring device based on high-precision current sensor and shunt |
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| CN (1) | CN217034077U (en) |
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2021
- 2021-12-15 CN CN202123153202.4U patent/CN217034077U/en active Active
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