CN107422165A - The closed-loop Hall current sensor that can be demagnetized online - Google Patents
The closed-loop Hall current sensor that can be demagnetized online Download PDFInfo
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- CN107422165A CN107422165A CN201710437381.3A CN201710437381A CN107422165A CN 107422165 A CN107422165 A CN 107422165A CN 201710437381 A CN201710437381 A CN 201710437381A CN 107422165 A CN107422165 A CN 107422165A
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- 230000005347 demagnetization Effects 0.000 claims abstract description 45
- 238000005259 measurement Methods 0.000 claims abstract description 17
- 230000005611 electricity Effects 0.000 claims description 12
- 238000007493 shaping process Methods 0.000 claims description 7
- 238000002955 isolation Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 4
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 23
- 230000008569 process Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 3
- 238000005538 encapsulation Methods 0.000 abstract description 2
- 230000005389 magnetism Effects 0.000 description 14
- 230000004907 flux Effects 0.000 description 6
- 230000033228 biological regulation Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 230000005355 Hall effect Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
Abstract
The invention discloses a kind of closed-loop Hall current sensor that can be demagnetized online, including secondary coil and current measurement circuit, the current measurement circuit includes Hall sensor, balancing circuitry and measurement resistance, and the secondary coil is connected with current measurement circuit and demagnetization loop respectively by first switch circuit and second switch circuit；The first switch circuit and second switch circuit are controlled by enable signal anti-phase each other, when the shut-off of first switch circuit, second switch circuit turn-on, secondary coil access demagnetization loop, when the shut-off of second switch circuit, first switch circuit turn-on, secondary coil access current measurement circuit；Simple in construction, small volume of the invention, is easily integrated encapsulation；/ demagnetization function switch control online is measured by single enabled control line, demagnetization process is automatically performed, loop of demagnetizing automatically resets, easy to operate reliable；Electric interfaces are compatible with existing Hall current sensor, facilitate popularization and application.
Description
Technical field
The present invention relates to electrical energy parameter measuring apparatus, more particularly to a kind of closed loop Hall current sensing that can be demagnetized online
Device.
Background technology
Hall current sensor is the sensing that a high current is transformed to secondary small voltage signal using Hall effect
Device, open loop type Hall current sensor and closed loop Hall current sensor can be divided into according to structure.Closed loop Hall current passes
Sensor exports reverse compensation electric current by the multiturn bucking coil being wound on magnetic core, for offsetting magnetic caused by primary current
It is logical so that magnetic flux remains zero in magnetic circuit, and realizes big electricity according to the corresponding relation between compensation electric current and primary current
Flow measurement；Because the magnetic field at closed loop Hall current sensor air gap changes near Zero flux all the time, changes of magnetic field amplitude
Very small, the non-linear and hysteresis effect of magnetic core will not impact to output, therefore can obtain the preferable linearity, higher
Precision and Frequency Response, be widely used in the current detectings of various circuits.
During closed loop Hall current sensor application, when secondary circuit is not switched on power supply or sensor secondary is opened
Lu Shi, if the primary side in sensor will be magnetized by electric current, the magnetic core of sensor and produce remanent magnetism；Remanent magnetism once produces,
It will not disappear automatically, under normal operating conditions by long-term existence, the presence of magnetic core remanent magnetism will influence the measurement accuracy of sensor
And unidirectionally change the measurement range of sensor；In terms of Hall current sensor magnetic core demagnetization, sensor-based enclosed construction,
Currently used effectively demagnetizing method is to disconnect secondary power supply, decays by the suitable alternating current of grade and gradually it in primary side
Amplitude, until for zero, but for high current application scenario, such as electric automobile charging station, generation of electricity by new energy application environment, acceptor
Loop structure limits, adjustable ac source not necessarily condition, therefore carry out closed-loop Hall current sensor using this method
There is bigger difficulty in demagnetization, it is difficult to operate and application cost is significantly increased.
Patents/the document handled on magnetic core remanent magnetism in current sensor is described as follows：
1st, the patent of Application No. 200410042701.8 discloses a kind of gauge type electromagnetic current transducer remanent magnetism and suppressed
Method, this method be between the secondary and load of electromagnetic current transducer and connect voltage-limiting element composition remanent magnetism suppress dress
Put, i.e., when secondary output current exceedes the thresholding of setting, the electric current of secondary is by mainly from the branch road where remanent magnetism restraining device
Flow through, while the output voltage of current transformer secondary is limited to preset level, the magnetic flux in magnetic core is limited will not
Significantly increase, remanent magnetism will be limited in magnetic core after electric current termination, will not be excessive；The method can only carry out part suppression to remanent magnetism
System, it is impossible to remanent magnetism is completely eliminated；2nd, the patent of Application No. 201310080320.8 discloses a kind of remanence of current transformer and surveyed
Amount system and measuring method, by charging, discharging to current transformer and the data acquisition of reverse charging operating process, host computer
The current transformer data-signal that data cell is gathered is received, Correlation method for data processing is carried out, calculates remanence coefficient, and pass through
Carry out result compensation.The method need to configure exclusive data collecting unit and data handling machine, complicated, and cost is high；3、
From big vast big, application of the general Kalman filterings of Yang Yu in current transformer electromagnetic measurement,《Sensor and micro-system》,2012,31
(7):146-148, the document are handled on the basis of data acquisition by Kalman filtering, are eliminated sensor zero drift and are drawn
The error accumulation problem risen.This method is similar with the 2nd kind of method, it is necessary to configure exclusive data collecting unit and data processing calculating
Machine, complicated, cost is high；4th, well brightness magnetic flux types High-accuracy direct current current Hall digital sensor designs, science and technology circular,
2015.12, the document detects zero migration by the integrated A/D of MSP430 single-chip microcomputers, then exports reverse signal to passing by D/A
The zero point of sensor carries out Active Compensation.Measurement accuracy is the method increase, but the remanent magnetism of magnetic core can still influence the range of sensor.
5th, the patent application of Application No. 201510900052.9 discloses a kind of iron core of the direct voltage source based on polarity inversion and remained
Magnetic eliminates and measuring method, is realized by unit switch such as microprocessor, time measurement and electronic power switches and demagnetization is encouraged
Polarity Control and the actuation duration control.6th, the patent application of Application No. 200910241742.2 proposes a kind of based on auxiliary
The online detection and calibration method for Hall current sensor of power supply and alignment coil.In above-mentioned each method, in addition to the 1st, 4 kind of method,
Other method is required to need supporting dedicated peripherals, could complete the detection of magnetic core remanent magnetism and compensation, cost are higher；Each method
Remanent magnetism suppression and compensation deals are laid particular emphasis on, are not directed to magnetic core remanent magnetism demagnetization processing.
In summary, the magnetic core demagnetizing method of closed-loop Hall current sensor is less at present, and existing similar demagnetizer is equal
The problems such as complicated, operating difficulties, bad adaptability be present, therefore with the progress of sensing technology and automatic technology, research
The online demagnetization technology of closed-loop Hall current sensor is significant.
The content of the invention
Goal of the invention：The purpose of the present invention is the problem of presence based on prior art, there is provided a kind of without special periphery
Corollary equipment is the closed-loop Hall current sensor that can be achieved to demagnetize online.
Technical scheme：A kind of closed-loop Hall current sensor that can be demagnetized online, including secondary coil and measuring loop, institute
Stating measuring loop includes Hall sensor, balancing circuitry and measures resistance, and the secondary coil passes through first switch circuit and survey
Amount loop connects, is connected by second switch circuit with demagnetization loop；The first switch circuit and second switch circuit are by mutual
Controlled for anti-phase enable signal, when the shut-off of first switch circuit, second switch circuit turn-on, secondary coil access is demagnetized back
Road, when the shut-off of second switch circuit, first switch circuit turn-on, secondary coil access measuring loop；The first switch electricity
Road and the FET that second switch circuit is low on-resistance.
Contrary compensation electric current is transformed into after the output amplification of the Hall sensor, secondary is accessed by first switch circuit
Coil, current measurement result is obtained by the corresponding relation between primary current and compensation electric current.
The demagnetization loop includes sine wave generating circuit, the sinusoidal signal of sine-wave generator is converted into gain-adjusted
The shaping circuit of pulse signal, the programmable amplifying circuit that the sinusoidal signal of sine-wave generator is amplified, by programming amplifying
Sinusoidal signal after circuit amplification is converted to the isolation drive module of current signal, and is connected and produces with the enable signal
The gain direction selecting module of raw gain direction selection signal；The gain-adjusted pulse signal and gain direction selection signal are
The control signal of programmable amplifying circuit, gain direction selection signal are used for the gain direction for controlling programmable amplifying circuit.
The demagnetization loop also includes negative circuit, and the enable signal is connected by negative circuit and second switch circuit
Connect；When enable signal is high level, first switch circuit turn-on, the shut-off of second switch circuit, when enable signal is low level
When, the shut-off of first switch circuit, second switch circuit turn-on；The enable signal line is kept when not connecing vacantly by pull-up circuit
For high level state.
Preferably, filter circuit is provided between the sine-wave generator and programmable amplifying circuit.
Operation principle：When the primary current loop open circuit or primary current of sensor are zero, enable signal line is connected to
Low level so that secondary coil is isolated with measuring loop, and accesses demagnetization loop；The gain of the programmable amplifying circuit is in just
Begin maximum state of value, and low level enable signal controls the gain direction of programmable amplifying circuit to reduce, shaping circuit formed with
Gain-adjusted pulse signal of the sine-wave generator oscillator signal with frequency；In gain-adjusted pulse signal and gain direction control letter
Number collective effect under, the gain of programmable amplifying circuit will be gradually reduced, until be zero, now demagnetization operation is completed；Demagnetization behaviour
After the completion of work, enable signal line is connected to high level, the secondary coil of closed-loop Hall current sensor from demagnetization loop switch to
Measuring loop；Now the gain direction of the programmable amplifying circuit in demagnetization loop is increase, is made in the accumulation of gain-adjusted pulse
Under, the output of the programmable amplifying circuit in loop of demagnetizing automatically resets to original maximum from zero；During practical operation, demagnetization operation
It can be repeated, need to only ensure that certain time interval is completed gain so as to programmable amplifying circuit and resetted.
Beneficial effect：The present invention compared with prior art, has following significant advantage：1st, the present invention is enabled by single
Control line measures/demagnetization function switch control online, easy to operate reliable；2nd, demagnetization process is automatically performed：Secondary coil
Demagnetization current decay automatically since saturation current, until for zero；Under the repetition driving of enable signal, demagnetization is repeated,
Lift demagnetization effectiveness；3rd, demagnetization loop automatically resets, and when enable signal is high level, demagnetization loop isolates with secondary coil,
The programming amplifying output in demagnetization loop automatically resets to initial saturation value；4th, electric interfaces and existing Hall current sensor are simultaneous
Hold：Enabled control line is vacantly defaulted as high level state, and closed-loop Hall current sensor is measuring state；5th, simple in construction, body
Product is small, is easily integrated encapsulation.
Brief description of the drawings
Fig. 1 is the control principle drawing of the present invention；
Fig. 2 is the online demagnetization control flow chart of the embodiment of the present invention.
Embodiment
Technical scheme is described in further detail with reference to embodiment and accompanying drawing；It should be understood that the present embodiment
It is only illustrative of the invention and is not intended to limit the scope of the invention, after the present invention has been read, those skilled in the art couple
The modification of the various equivalent form of values of the present invention falls within the application appended claims limited range.
As shown in figure 1, a kind of closed-loop Hall current sensor that can be demagnetized online, including secondary coil 2 and measuring loop
3, the secondary coil 2 is connected by first switch circuit 4 and measuring loop 3, by second switch circuit 5 and demagnetization loop 1
Connection；First switch circuit 4 and second switch circuit 5 are used for the access shape for switching secondary coil 2 under the control of enable signal
State, its control signal is anti-phase each other, will not simultaneously turn on；It is secondary when first switch circuit 4 turns off, second switch circuit 5 turns on
The access demagnetization loop 1 of sideline circle 2, when second switch circuit 5 turns off, first switch circuit 4 turns on, the access of secondary coil 2 is surveyed
Measure loop 3.
Embodiment：
It is illustrated in figure 2 the online demagnetization control flow chart of the present embodiment；Measuring loop 3 includes Hall sensor, balance
Circuit and measurement resistance；Contrary compensation electric current is transformed into after the output amplification of Hall sensor, is accessed by first switch circuit 4
Secondary coil 2, offset the magnetic flux that primary current is formed so that the magnetic flux in magnetic core magnetic circuit is zero；Collection compensation electric current is measuring
Ohmically pressure drop, and current measurement result is obtained according to the corresponding relation between primary current and compensation electric current.
The demagnetization loop 1 includes sine wave generating circuit 101, shaping circuit 102, programmable amplifying circuit 103, isolation drive
Dynamic model block 104, gain direction selecting module 105 and negative circuit 106.
Wherein, negative circuit 106 is anti-phase by enable signal, and the opposite control signal of generation logic state controls first respectively
On-off circuit 4 and second switch circuit 5；When enable signal is low level, second switch circuit 5 turns on, first switch circuit 4
Shut-off, the access demagnetization of secondary coil 2 loop 1；When enable signal is high level, second switch circuit 5 turns off, first switch electricity
Road 4 turns on, and secondary coil 2 accesses measuring loop 3；First switch circuit 4 and second switch circuit 5 are imitated for the field of low on-resistance
Ying Guan；In the present embodiment, high level state is remained by pull-up circuit when enable signal line does not connect vacantly.
Sine wave generating circuit 101 is used to produce the pure oscillation signal without DC component, through programming amplifying electricity after filtering
Amplify on road；
Shaping circuit 102 is used to sinusoidal signal caused by sine-wave generator 101 being converted into corresponding digit pulse letter
Number, gain control is carried out to programmable amplifying circuit 103；
Programmable amplifying circuit 103 is made up of digital regulation resistance and operational amplifier, and digital regulation resistance is located at operation amplifier electricity
The backfeed loop on road；Its function is to amplify sinusoidal signal, then is converted into corresponding current signal through isolation drive module 104；
Input signal is the sinusoidal signal that sine-wave generator 101 exports；The control signal of programmable amplifying circuit 103 is selected for gain direction
Signal and gain-adjusted pulse signal are selected, when enable signal is low, the gain direction of programmable amplifying circuit 103 is reduces, directly
It is zero to output；When enable signal is high, the gain direction of programmable amplifying circuit 103 is increase, until output saturation；Gain
Regulation pulse is to form data signal, Mei Gezheng after the shaped shaping of circuit 102 of sinusoidal signal caused by sine-wave generator 101
String wave period produces a regulation pulse, and the gain of programmable amplifying circuit adjusts one grade by gain direction initialization；Programming amplifying electricity
The constructive method on road 103 has a variety of, then its circuit structure can also change therewith；Programmable amplifying circuit 103 proposed by the invention
It is the combined type programmable amplifying circuit using digital regulation resistance as feedback resistance, it is not necessary to the intelligent chip of single-chip microcomputer etc, and
Only increase an enabled control line.
Isolation drive module 104 is used to the sine voltage signal that programmable amplifying circuit 103 inputs being converted to current signal,
During demagnetization secondary coil is applied to through second switch circuit 5；
Gain direction selecting module 105 is used for the gain direction for controlling programmable amplifying circuit 103, when enable signal is high electricity
Usually, sensor is current measurement pattern, and lifting selection control programmable amplifying circuit 103 adjusts to gain augment direction；When making
When energy signal is low level, sensor is demagnetization mode of operation, and lifting selection controls programmable amplifying circuit 103 to gain reduction side
To adjustment；
The online demagnetization operating process of the present invention：When primary current loop open circuit or primary current are zero, you can carry out
Demagnetization operation；Enable signal line is connected to low level, now the secondary coil 2 of closed-loop Hall current sensor and measuring loop 3
Isolation, and access demagnetization loop 1；The gain of programmable amplifying circuit 103 is in initial maximum state of value, low level enable signal
Controlling the gain direction of programmable amplifying circuit 103, shaping circuit 102 is formed and the oscillator signal of sine-wave generator 101 to reduce
With the gain-adjusted pulse signal of frequency；It is program control under the collective effect of gain-adjusted pulse signal and gain direction control signal
The gain of amplifying circuit 103 will be gradually reduced, until being zero, now demagnetization operation is completed.
After the completion of demagnetization operation, enable signal line is connected to high level, the secondary coil 2 of closed-loop Hall current sensor from
Demagnetization loop 1 is switched to measuring loop 3；Now the gain direction of the programmable amplifying circuit 103 in demagnetization loop 1 is increase,
Under the cumulative function of gain-adjusted pulse, the output of the programmable amplifying circuit 103 in loop 1 of demagnetizing is automatically reset to initially most from zero
Big value；During practical operation, demagnetization operation can be repeated, and only certain time interval need to be ensured so as to programmable amplifying circuit 103
Gain is completed to reset.
Claims (7)
1. a kind of closed-loop Hall current sensor that can be demagnetized online, including secondary coil (2) and measuring loop (3), the survey
Measuring loop (3) includes Hall sensor, balancing circuitry and measurement resistance, it is characterised in that：The secondary coil (2) passes through first
On-off circuit (4) is connected with measuring loop (3), is connected by second switch circuit (5) with measuring loop (3)；Described first opens
Powered-down road (4) and second switch circuit (5) are controlled by enable signal anti-phase each other, when first switch circuit (4) shut-off, second
When on-off circuit (5) turns on, secondary coil (2) access demagnetization loop (1), when second switch circuit (5) shut-off, first switch electricity
When road (4) turns on, secondary coil (2) access measuring loop (3).
2. closed-loop Hall current sensor according to claim 1, it is characterised in that：The output of the Hall sensor is put
Contrary compensation electric current is transformed into after big, secondary coil (2) is accessed by first switch circuit (4), by primary current and compensation electricity
Corresponding relation between stream obtains current measurement result.
3. closed-loop Hall current sensor according to claim 1, it is characterised in that：Demagnetization loop (1) is included just
String wave generation circuit (101), the shaping electricity that the sinusoidal signal of sine-wave generator (101) is converted into gain-adjusted pulse signal
Road (102), the programmable amplifying circuit (103) for being amplified the sinusoidal signal of sine-wave generator (101), by programming amplifying electricity
Sinusoidal signal after the amplification of road (103) is converted to the isolation drive module (104) of current signal, and connects with the enable signal
Connect and produce the gain direction selecting module (105) of gain direction selection signal；The gain-adjusted pulse signal and gain side
To selection signal co- controlling programmable amplifying circuit (103).
4. closed-loop Hall current sensor according to claim 1, it is characterised in that：Demagnetization loop (1) also includes
Negative circuit (106), the enable signal are connected by negative circuit (106) with second switch circuit (5)；When enable signal is
During high level, first switch circuit (4) conducting, second switch circuit (5) shut-off, when enable signal is low level, first opens
Powered-down road (4) shut-off, second switch circuit (5) conducting.
5. closed-loop Hall current sensor according to claim 4, it is characterised in that：The enable signal line does not connect vacantly
When high level state remained by pull-up circuit.
6. closed-loop Hall current sensor according to claim 1, it is characterised in that：In the sine-wave generator
(101) filter circuit is provided between programmable amplifying circuit (103).
7. closed-loop Hall current sensor according to claim 1, it is characterised in that：The first switch circuit (4) and
Second switch circuit (5) is the FET of low on-resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710437381.3A CN107422165B (en) | 2017-06-09 | 2017-06-09 | Closed loop hall current sensor capable of on-line demagnetizing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710437381.3A CN107422165B (en) | 2017-06-09 | 2017-06-09 | Closed loop hall current sensor capable of on-line demagnetizing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107422165A true CN107422165A (en) | 2017-12-01 |
| CN107422165B CN107422165B (en) | 2023-11-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710437381.3A Active CN107422165B (en) | 2017-06-09 | 2017-06-09 | Closed loop hall current sensor capable of on-line demagnetizing |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521903A (en) * | 2020-07-03 | 2020-08-11 | 长沙润迅通信设备有限公司 | SPD resistive current online intelligent monitoring device and monitoring method |
| CN114977455A (en) * | 2022-06-16 | 2022-08-30 | 华中科技大学 | Permanent magnetism equipment is whole to be magnetized and demagnetized integration system |
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| CN204155688U (en) * | 2014-10-29 | 2015-02-11 | 国家电网公司 | A kind of current transformer demagnetizer |
| CN104520721A (en) * | 2012-01-19 | 2015-04-15 | 邹高芝 | Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor |
| CN105118606A (en) * | 2015-09-11 | 2015-12-02 | 浙江大学 | Demagnetizing circuit and method for removing residual magnetism of electromagnetic current transformer on line |
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2017
- 2017-06-09 CN CN201710437381.3A patent/CN107422165B/en active Active
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| CN104520721A (en) * | 2012-01-19 | 2015-04-15 | 邹高芝 | Coaxial dual-loop magnetic core coil component for high-precision cross-core closed-loop hall current sensor |
| CN103176147A (en) * | 2013-03-13 | 2013-06-26 | 江苏省电力公司电力科学研究院 | Current transformer remanence measurement system and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111521903A (en) * | 2020-07-03 | 2020-08-11 | 长沙润迅通信设备有限公司 | SPD resistive current online intelligent monitoring device and monitoring method |
| CN114977455A (en) * | 2022-06-16 | 2022-08-30 | 华中科技大学 | Permanent magnetism equipment is whole to be magnetized and demagnetized integration system |
| CN114977455B (en) * | 2022-06-16 | 2023-04-28 | 华中科技大学 | Integral magnetizing and demagnetizing integrated system for permanent magnet equipment |
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| Publication number | Publication date |
|---|---|
| CN107422165B (en) | 2023-11-03 |
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