CN114935675A - Electric energy meter and method for measuring current - Google Patents
Electric energy meter and method for measuring current Download PDFInfo
- Publication number
- CN114935675A CN114935675A CN202210880438.8A CN202210880438A CN114935675A CN 114935675 A CN114935675 A CN 114935675A CN 202210880438 A CN202210880438 A CN 202210880438A CN 114935675 A CN114935675 A CN 114935675A
- Authority
- CN
- China
- Prior art keywords
- current
- magnetic field
- signal
- electric energy
- magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
Abstract
The embodiment of the invention provides an electric energy meter and a method for measuring current, and relates to the technical field of electric energy meter measurement, wherein the electric energy meter comprises a signal acquisition unit and a signal processing unit, wherein the signal acquisition unit comprises at least one group of magnetic cores and feedback coils; the feedback coil is wound on the magnetic core to generate a compensation magnetic field for closed-loop detection; the magnetic core is provided with a magnetic sensing chip and is used for detecting magnetic field information of an induction magnetic field generated by current to be detected, and the current to be detected is AC-DC mixed current; and the signal processing unit is used for determining the alternating current value and the direct current value of the current to be measured according to the magnetic field information. The electric energy meter can detect direct current and alternating current simultaneously, and has simple structure and high detection precision.
Description
Technical Field
The invention relates to the technical field of electric energy meter measurement, in particular to an electric energy meter and a method for measuring current.
Background
An electric energy meter is an instrument for measuring electric energy, also called watt-hour meter, fire meter, kilowatt-hour meter, and refers to an instrument capable of measuring various electric quantities. With the continuous access of new energy such as wind energy, solar energy and the like, a great amount of nonlinear electric equipment such as IGBTs, high-frequency MOS switches, various alternating current-direct current conversion devices, electric arc furnaces, electric welding machines and the like appear, and current signals in an electric circuit of the electric meter are not traditional 50Hz sine waves any more, but various pulse signals with complex shapes.
At present, the electric energy is measured by the electric meter by adopting a mutual inductor and manganese copper, although the measurement precision is very high, the manganese copper sheet generates heat seriously when the electric meter works at a large current, and the loss of the electric energy is formed; and the mutual inductor can only measure alternating current, can not measure direct current, can not satisfy direct current measurement application demand, and the three-phase ammeter also has the problem because the power consumption load influences measurement accuracy.
Disclosure of Invention
The embodiment of the invention aims to provide an electric energy meter and a method for measuring current, wherein the electric energy meter can simultaneously detect direct current and alternating current, and has the advantages of simple structure and high detection precision.
The invention provides an electric energy meter which comprises a signal acquisition unit and a signal processing unit, wherein the signal acquisition unit comprises at least one group of magnetic cores and feedback coils; the feedback coil is wound on the magnetic core to generate a compensation magnetic field for closed-loop detection, a magnetic sensing chip is arranged on the magnetic core and used for detecting magnetic field information of an induction magnetic field generated by current to be detected, and the current to be detected is AC-DC mixed current; and the signal processing unit is used for determining the alternating current value and the direct current value of the current to be measured according to the magnetic field information.
Optionally, the signal processing unit includes an ac/dc demodulation module, and the ac/dc demodulation module includes a high-pass filter circuit and a low-pass filter circuit, and is configured to divide the ac/dc mixed current into dc and ac.
Optionally, the signal processing unit further includes a signal amplifying module, a compensating module and a feedback module; the signal amplification module is used for amplifying magnetic field information to obtain an amplified signal, the compensation module is used for compensating the amplified signal to obtain a compensation signal, and the compensation signal is an input signal of the alternating current-direct current demodulation module.
Optionally, the feedback module drives a feedback coil according to the compensation signal, so as to balance the induced magnetic field.
Optionally, the signal processing unit further includes an electric energy metering unit and a display unit; the electric energy metering unit is used for determining the direct current value and the alternating current value, and the display unit is used for displaying the direct current value and the alternating current value.
Optionally, the magnetic field information includes at least a magnetic field strength of the induced magnetic field.
Optionally, the current to be measured passes through the magnetic core.
On the other hand, the invention provides a method for measuring current, which comprises the steps of inducing current to be measured through a magnet to generate an induced magnetic field, wherein the current to be measured is alternating current and direct current, the magnet comprises a magnetic core and a feedback coil, the feedback coil is wound on the magnetic core, and a magnetic sensing chip is arranged on the magnetic core; detecting magnetic field information of the induction magnetic field through the magnetic sensitive chip; and determining the alternating current value and the direct current value of the current to be measured according to the magnetic field information.
Optionally, the determining the ac value and the dc value of the current to be measured according to the magnetic field information includes: sequentially amplifying and compensating the magnetic field information to obtain a compensation signal; and shunting the compensation signal to obtain direct current and alternating current.
Optionally, a feedback coil is driven according to the compensation signal for balancing the induced magnetic field.
Optionally, the current to be measured passes through the magnetic core.
The invention relates to an electric energy meter which comprises a signal acquisition unit and a signal processing unit, wherein the signal acquisition unit comprises at least one group of magnetic cores and feedback coils; the feedback coil is wound on the magnetic core to generate a compensation magnetic field for closed-loop detection; the magnetic core is provided with a magnetic sensing chip and is used for detecting magnetic field information of an induction magnetic field generated by current to be detected, and the current to be detected is AC-DC mixed current; and the signal processing unit is used for determining the alternating current value and the direct current value of the current to be measured according to the magnetic field information. The electric energy meter can detect direct current and alternating current simultaneously, and has the advantages of simple structure and high detection precision.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 and 2 are schematic structural diagrams of an electric energy meter according to the present invention;
FIG. 3 is a schematic diagram of a signal acquisition unit of the electric energy meter of the present invention;
FIG. 4 is a schematic diagram of an electric energy metering unit and a display unit of the electric energy meter of the present invention;
FIG. 5 is a schematic flow chart of a method of measuring current in accordance with the present invention;
fig. 6 is a schematic diagram of the present invention showing the decomposition of ac/dc signals into dc and ac signals.
Description of the reference numerals
100-a signal acquisition unit;
200-a signal processing unit;
201-a magneto-sensitive element;
203-current signal;
204 — output signal;
101-a magnetic core;
102-core gap;
104-a feedback coil;
302-an electric energy metering unit;
303-micro processing module;
304-LCD display module;
305-a communication module;
306-storage module.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 and fig. 2 are schematic structural diagrams of an electric energy meter according to the present invention, and as shown in fig. 1, the electric energy meter according to the present invention includes a signal acquisition unit 100 and a signal processing unit 200, where the signal acquisition unit 100 includes at least one set of magnetic core 101 and feedback coil 104. According to a specific embodiment, the magnetic core 101 is a magnetic ring with a diameter of 5mm-100mm and a height of 2mm-10mm, and the material of the magnetic core 101 is at least one of permalloy, silicon steel sheet, iron-based amorphous, nanocrystalline and the like.
The feedback coil 104 is wound around the magnetic core 101 for inducing a current to be measured to generate an induced magnetic field. And the magnetic core 101 is provided with a magnetic sensitive chip for detecting magnetic field information of an induction magnetic field generated by the current to be detected. The magnetic-sensing chip is a chip with a magnetic-sensing effect, preferably, the magnetic-sensing chip is at least one of a fluxgate, a tunnel magnetic resistance, an anisotropic magnetic resistance, a giant magnetic resistance or a Hall chip, the signal precision sensed by the magnetic-sensing chip is higher, the signal-to-noise ratio is better, the power consumption and the heat generation are low, the signal detection range is wider, and the realization of large-current detection is facilitated. The feedback coil 104 is wound around the core 101 to generate a compensating magnetic field for closed loop detection.
The current to be measured is an alternating current and direct current mixed current, and the signal processing unit 200 is configured to determine an alternating current value and a direct current value of the current to be measured according to the magnetic field information.
As shown in fig. 2, the current signal 203 of the current to be detected in the electric energy meter may be alternating current, direct current, and alternating-current-direct current, and the current signal 203 mainly detected in the present application is alternating-current-direct current.
The electric current that awaits measuring passes magnetic core 101, feedback coil 104 winding magnetic core 101 senses the electric current that awaits measuring produces induction field, magnetism sensing chip (magnetic sensing element 201) detects induction field's magnetic field information, magnetic field information includes induction field's magnetic field intensity at least, and the magnetic field information that detects is voltage signal, then voltage signal input signal processing unit 200, signal processing unit 200 includes alternating current-direct current demodulation module, alternating current-direct current demodulation module includes high pass filter circuit and low pass filter circuit for divide into direct current and interchange with the alternating current direct current hybrid current.
The signal processing unit 200 further comprises a signal amplification module, a compensation module and a feedback module; the signal amplification module is used for amplifying the magnetic field information to obtain an amplified signal and filtering noise in the signal, the compensation module is used for processing the amplified signal and compensating nonlinearity, zero offset and the like of the signal to obtain a compensation signal, and the compensation signal is an input signal of the AC-DC demodulation module. The feedback module drives the feedback coil 104 according to the compensation signal, and is used for balancing the induction magnetic field, so that the inside of the magnetic core 101 reaches the so-called magnetic balance, and high-precision current detection is realized. The detected magnetic field information sequentially passes through the signal amplification and compensation circuit, a feedback signal is generated through the feedback module to form a signal output by closed-loop processing, then an output signal 204 is obtained through an output end of the AC/DC demodulation module, and after the signal output by the magnetic sensing element 201 is subjected to feedback processing, the anti-interference capability is higher, and the signal precision is higher. The signals of amplification, compensation and feedback processing are both alternating current and direct current mixed current, the compensation signals are also alternating current and direct current mixed current, and the signals are separated only after being processed by the alternating current and direct current adjusting module. The output signal 204 is an ac signal and a dc signal, and specifically includes: direct current and alternating current.
Fig. 6 is a schematic diagram of decomposing the ac/dc signal into dc and ac signals, and as shown in fig. 6, the ac/dc mixed signal collected by the magnetic sensor chip of the electric energy meter is processed to obtain the dc signal and the ac signal.
When the existing electric energy meter measures an alternating current-direct current mixed signal through a current transformer, a magnetic core in the transformer can be easily saturated or the detection precision of the current transformer can be reduced due to the direct current component, the detection precision requirement of the corresponding precision level can not be met, and meanwhile, the size of the direct current component can not be detected.
Fig. 3 is a schematic diagram of a signal acquisition unit of the electric energy meter of the present invention, as shown in fig. 3, a magnetic sensing chip (a magnetic sensing element 201) is disposed on the magnetic core 101, specifically, the magnetic core 101 is disposed with a gap for placing the magnetic sensing chip, and the size of the magnetic core gap 102 is determined according to the cross section of the magnetic core 101 and the length of the magnetic circuit, for example: the larger the cross section, the larger the air gap; the larger the magnetic path length, the larger the air gap.
The feedback coil 104 is wound around the magnetic core 101 and used for inducing a current to be measured so as to generate an induced magnetic field, and a magnetic sensing chip (a magnetic sensing element 201) on the magnetic core 101 is used for detecting magnetic field information of the induced magnetic field.
Fig. 4 is a schematic diagram of an electric energy metering unit 302 and a display unit of the electric energy meter of the present invention, and as shown in fig. 4, the electric energy meter includes a signal acquisition unit 100, a signal processing unit 200, an electric energy metering unit 302, a micro-processing module 303, an LCD display module 304, a communication module 305, and a storage module 306.
The current to be measured passes through the signal acquisition unit 100 and the signal processing unit 200 to obtain a direct current signal and an alternating current signal, and the electric energy metering unit 302 meters the direct current signal and the alternating current signal respectively to obtain a direct current value and an alternating current value.
The microprocessor 303 is configured to transmit the dc current value and the ac current value to the LCD display module 304, the communication module 305, and the storage module 306. The LCD display module 304 is at least used for displaying the dc current value and the ac current value in real time; the communication module 305 is at least used for communicating with a head office or other electric energy meters; the storage module 306 is at least used for storing the dc current value and the ac current value. The electric energy meter can not only measure alternating current signals, but also measure direct current signals, and further ensures the alternating current and direct current simultaneous measurement function of the electric energy meter.
The electric energy meter of the present invention comprises: the device comprises a signal acquisition unit 100 and a signal processing unit 200, wherein the signal acquisition unit 100 comprises at least one group of magnetic cores 101 and a feedback coil 104; the feedback coil 104 is wound on the magnetic core 101 to generate a compensation magnetic field for closed-loop detection; the magnetic core 101 is provided with a magnetic sensing chip and is used for detecting magnetic field information of an induction magnetic field generated by current to be detected, and the current to be detected is alternating current and direct current mixed current; and the signal processing unit 200 is configured to determine an ac value and a dc value of the current to be measured according to the magnetic field information. The electric energy meter can detect direct current and alternating current simultaneously, and has the advantages of simple structure and high detection precision.
Fig. 5 is a schematic flow chart of a method of measuring current according to the present invention, and as shown in fig. 5, the method of measuring current according to the present invention includes: step S501, inducing current to be measured through a magnet to generate an induced magnetic field, wherein the current to be measured is alternating current and direct current, the magnet comprises a magnetic core 101 and a feedback coil 104, the feedback coil 104 is wound on the magnetic core 101, and a magnetic sensing chip is arranged on the magnetic core 101; step S502, detecting the magnetic field information of the induction magnetic field through the magnetic sensitive chip; step S503 is to determine an ac value and a dc value of the current to be measured according to the magnetic field information. Specifically, the determining the ac value and the dc value of the current to be measured according to the magnetic field information includes: sequentially amplifying and compensating the magnetic field information to obtain a compensation signal; and shunting the compensation signal to obtain direct current and alternating current. The feedback coil 104 is driven in accordance with the compensation signal for balancing the induced magnetic field. The method for measuring the current can simultaneously detect the direct current and the alternating current.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (11)
1. An electric energy meter is characterized by comprising a signal acquisition unit and a signal processing unit,
the signal acquisition unit comprises at least one group of magnetic cores and a feedback coil;
the feedback coil is wound on the magnetic core to generate a compensation magnetic field for closed-loop detection;
the magnetic core is provided with a magnetic sensing chip and is used for detecting magnetic field information of an induction magnetic field generated by current to be detected, and the current to be detected is AC-DC mixed current;
and the signal processing unit is used for determining the alternating current value and the direct current value of the current to be measured according to the magnetic field information.
2. The electric energy meter according to claim 1,
the signal processing unit comprises an alternating current and direct current demodulation module, and the alternating current and direct current demodulation module comprises a high-pass filter circuit and a low-pass filter circuit and is used for dividing alternating current and direct current mixed current into direct current and alternating current.
3. The electric energy meter according to claim 2,
the signal processing unit also comprises a signal amplification module, a compensation module and a feedback module;
the signal amplification module is used for amplifying magnetic field information to obtain an amplified signal, the compensation module is used for compensating the amplified signal to obtain a compensation signal, and the compensation signal is an input signal of the alternating current-direct current demodulation module.
4. An electric energy meter according to claim 3,
and the feedback module drives a feedback coil according to the compensation signal and is used for balancing the induction magnetic field.
5. The electric energy meter according to claim 2,
the signal processing unit also comprises an electric energy metering unit and a display unit;
the electric energy metering unit is used for determining a direct current value and an alternating current value, and the display unit is used for displaying the direct current value and the alternating current value.
6. The electric energy meter according to claim 1,
the magnetic field information comprises at least a magnetic field strength of the induced magnetic field.
7. The electric energy meter according to claim 1,
the current to be measured passes through the magnetic core.
8. A method of measuring a current, comprising
Inducing current to be measured through a magnet to generate an induction magnetic field, wherein the current to be measured is alternating current and direct current, the magnet comprises a magnetic core and a feedback coil, the feedback coil is wound on the magnetic core, and a magnetic sensitive chip is arranged on the magnetic core;
detecting magnetic field information of the induction magnetic field through the magnetic sensitive chip; and
and determining the alternating current value and the direct current value of the current to be measured according to the magnetic field information.
9. The method of claim 8, wherein determining the ac and dc values of the current to be measured from the magnetic field information comprises:
sequentially amplifying and compensating the magnetic field information to obtain a compensation signal;
and shunting the compensation signal to obtain direct current and alternating current.
10. The method of claim 9,
and driving a feedback coil according to the compensation signal for balancing the induction magnetic field.
11. The method of claim 8,
the current to be measured passes through the magnetic core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210880438.8A CN114935675A (en) | 2022-07-25 | 2022-07-25 | Electric energy meter and method for measuring current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210880438.8A CN114935675A (en) | 2022-07-25 | 2022-07-25 | Electric energy meter and method for measuring current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114935675A true CN114935675A (en) | 2022-08-23 |
Family
ID=82867860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210880438.8A Pending CN114935675A (en) | 2022-07-25 | 2022-07-25 | Electric energy meter and method for measuring current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114935675A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116223903A (en) * | 2023-05-06 | 2023-06-06 | 烟台东方威思顿电气有限公司 | Anti-interference circuit and method for three-phase three-wire electric energy meter under alternating current magnetic field |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6954060B1 (en) * | 2003-03-28 | 2005-10-11 | Edel Thomas G | a-c current transformer functional with a d-c current component present |
| CN205015382U (en) * | 2015-07-08 | 2016-02-03 | 广州开能电气实业有限公司 | Transformer neutral point dc component detection device |
| CN110658374A (en) * | 2019-11-14 | 2020-01-07 | 河北申科电子股份有限公司 | Current transformer with wide frequency, wide measurement and anti-magnetic interference capability |
| CN112230043A (en) * | 2020-10-10 | 2021-01-15 | 浙江巨磁智能技术有限公司 | Method for separating alternating current from direct current by utilizing magnetic balance principle |
| CN113325233A (en) * | 2021-06-02 | 2021-08-31 | 云南电网有限责任公司电力科学研究院 | System and method for modulating and measuring ripple electric energy in direct current electric energy |
-
2022
- 2022-07-25 CN CN202210880438.8A patent/CN114935675A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6954060B1 (en) * | 2003-03-28 | 2005-10-11 | Edel Thomas G | a-c current transformer functional with a d-c current component present |
| CN205015382U (en) * | 2015-07-08 | 2016-02-03 | 广州开能电气实业有限公司 | Transformer neutral point dc component detection device |
| CN110658374A (en) * | 2019-11-14 | 2020-01-07 | 河北申科电子股份有限公司 | Current transformer with wide frequency, wide measurement and anti-magnetic interference capability |
| CN112230043A (en) * | 2020-10-10 | 2021-01-15 | 浙江巨磁智能技术有限公司 | Method for separating alternating current from direct current by utilizing magnetic balance principle |
| CN113325233A (en) * | 2021-06-02 | 2021-08-31 | 云南电网有限责任公司电力科学研究院 | System and method for modulating and measuring ripple electric energy in direct current electric energy |
Non-Patent Citations (4)
| Title |
|---|
| 岳长喜等: "基于磁通门原理的零磁通交直流电流传感器", 《电测与仪表》 * |
| 李嘉鸿等: "智能巨磁阻直流电流传感器设计", 《物联网技术》 * |
| 杜萍: "电子式电能表中滤波器的设计", 《内蒙古科技与经济》 * |
| 杨晓光等: "直流叠加脉冲电流波形宽频带电流传感器", 《仪器仪表学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116223903A (en) * | 2023-05-06 | 2023-06-06 | 烟台东方威思顿电气有限公司 | Anti-interference circuit and method for three-phase three-wire electric energy meter under alternating current magnetic field |
| CN116223903B (en) * | 2023-05-06 | 2023-09-19 | 烟台东方威思顿电气有限公司 | Anti-interference circuit and method for three-phase three-wire electric energy meter under alternating current magnetic field |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103575960B (en) | giant magnetoresistance effect current sensor | |
| CN103308743B (en) | Direct current metering device | |
| CN207067224U (en) | A kind of leakage current sensor | |
| CN111650415B (en) | Self-powered current detection system and detection method for wide-current-band power transmission line | |
| CN203133146U (en) | Transformer neutral point current measuring device | |
| CN107085192A (en) | A kind of method and its device that ferromagnetic material hysteresis curve is measured in open-flux path | |
| CN103675396A (en) | Leak current detector for photovoltaic inverter | |
| CN110412336A (en) | A kind of detection probe of high precision electric current transducer | |
| CN114935675A (en) | Electric energy meter and method for measuring current | |
| JP4353465B2 (en) | Railway vehicle magnetic field measuring method and magnetic field measuring apparatus | |
| CN203502481U (en) | Single-magnetic-ring four-coil DC current detection device | |
| CN104614688B (en) | For the c-type sensor and its detection method of D.C. magnetic biasing dynamic magnetic-flux measurement | |
| CN101923152B (en) | Room temperature calibration method for equivalent error area of gradiometer | |
| Ripka et al. | Current sensor in PCB technology | |
| Cataliotti et al. | Characterization of clamp-on current transformers under nonsinusoidal conditions | |
| CN103941201A (en) | Measuring method of magnetic parameters of magnetic material | |
| CN103901368A (en) | Magnetic parameter measuring device for magnetic materials | |
| CN106291431A (en) | A kind of tracking accuracy measuring method of current sensor | |
| US5831424A (en) | Isolated current sensor | |
| CN1913056A (en) | High magnetic conductivity Rogowski coil with air-gap iron core | |
| CN109541507A (en) | Monolithic ferrometer, detection device and detection method for grain-oriented Si steel sheet performance detection | |
| CN203881921U (en) | Magnetic parameter measuring device for magnetic material | |
| CN114280350B (en) | High-precision current sensor and shunt-based high-current measurement method | |
| Yang et al. | Design and Hardware Experiment of Concentrating Magnetic Ring of Current Sensors Used in Open-Loop Fluxgate | |
| Ma et al. | DC sensor based on magnetic potential self-balance and feedback compensation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220823 |
|
| RJ01 | Rejection of invention patent application after publication |