CN105785095A - Constant-amplitude DC pulse signal measurement circuit and degaussing method thereof - Google Patents
Constant-amplitude DC pulse signal measurement circuit and degaussing method thereof Download PDFInfo
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- CN105785095A CN105785095A CN201610256807.0A CN201610256807A CN105785095A CN 105785095 A CN105785095 A CN 105785095A CN 201610256807 A CN201610256807 A CN 201610256807A CN 105785095 A CN105785095 A CN 105785095A
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- pulse signal
- current
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- amplitude
- measuring circuit
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/183—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using transformers with a magnetic core
-
- 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
- G01R19/04—Measuring peak values or amplitude or envelope of ac or of pulses
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
Abstract
The invention discloses a constant-amplitude DC pulse signal measurement circuit and a degaussing method thereof. The circuit comprises a magnetic core, a primary winding arranged on the magnetic core, and a first secondary winding, wherein the primary winding is connected with measured current; the first secondary winding is connected with a measurement instrument; and the magnetic core is also provided with a second secondary winding whose magnetic flux is opposite to that of the primary winding. Through arranging the second secondary winding whose magnetic flux is opposite to that of the primary winding, in a condition of low cost, remanence and waveform distortion of the measurement circuit when the DC pulse signal is measured can be effectively reduced, and the measurement sensitivity and the measurement precision of the measurement circuit are thus improved.
Description
Technical field
The present invention relates to a kind of measuring circuit, particularly to a kind of constant amplitude DC pulse signal measuring circuit and demagnetization method thereof.
Background technology
Safety and economic operation is wanted in power system, it is necessary to installs some and measures instrument, with electric parameters various in measuring circuit, such as voltage, electric current, power, electric energy etc..We often further encounter the various electric parameters of measurement requirement high voltage and larger current.This measured numerical value is more correctly obtained, it is necessary to use transformer in order to more convenient.
In prior art measure DC current generally have three kinds of methods, they respectively:
One, diverter is accessed in circuit.By measuring the electric current that the voltage on diverter to flow through in measuring circuit, the method cannot accomplish that strong and weak electricity is isolated, and diverter essence is sample resistance, and in primary circuit, series connection accesses sample resistance and can produce voltage drop, affects primary circuit parameter.Meanwhile, the method is difficult to anti-interference.
Two, inductance type current transformer is accessed in circuit.Owing to inductance type operation of current transformers principle belongs to transformator, it can not measure pure direct current signal.There is, when measuring DC pulse signal, the phenomenon that iron circuit is saturated, reduce and measure sensitivity and the magnetic circuit saturation distortion of signal can occur, cause wave distortion.
Three, based on the Zero flux current measurement circuit of Hall element.The method adopts Hall element as measuring cell, injects cancellation current with opposite direction to magnetic circuit by amplified for the signal measured, so that magnetic circuit is in the duty of Zero flux.The method in the measurements, low frequency signal time effect fine.When measuring higher frequency signals, owing to signal intensity is fast, and the cancellation current that opposite direction is injected is due to the inductive obstacle Rapid Variable Design of electric current of coil, therefore also high-frequency signal can be produced wave distortion.
Summary of the invention
Present invention is primarily aimed at the above-mentioned technical problem of solution, it is provided that a kind of constant amplitude DC pulse signal measuring circuit reducing remanent magnetism and wave distortion.
The present invention also provides for the demagnetization method of a kind of constant amplitude DC pulse signal measuring circuit.
For achieving the above object, the technical scheme is that
A kind of constant amplitude DC pulse signal measuring circuit, including magnetic core, the armature winding being arranged on magnetic core, the first secondary windings, described armature winding connects tested electric current, described first secondary windings connects measures instrument, is additionally provided with the second subprime winding that flow direction is contrary with armature winding on described magnetic core.
Further, described second subprime winding accesses DC current.
Further, the DC current amplitude of described second subprime winding is equal with the meansigma methods of the tested current amplitude of armature winding.
Further, described tested electric current is 20mA current loop circuit signal.
Another technical scheme of the present invention is:
The demagnetization method of a kind of constant amplitude DC pulse signal measuring circuit as described in any one of Claims 1-4, it is characterised in that comprise the steps:
Step 1, constant amplitude DC pulse signal access armature winding；
Step 2, apply and armature winding electric current in opposite direction to second subprime winding；
Step 3, instrument obtains measured value from measuring.
Further, in step 2, second subprime winding is contrary with the flow direction of armature winding.
Further, in step 2, DC current is applied to second subprime winding.
Further, the DC current amplitude of second subprime winding is equal with the meansigma methods of the tested current amplitude of armature winding.
To sum up content, a kind of constant amplitude DC pulse signal measuring circuit of the present invention and demagnetization method thereof, the second subprime winding contrary with armature winding by arranging flow direction, can when low cost, efficiently reduce remanent magnetism and the wave distortion of measuring circuit when measuring DC pulse signal, thus improving measurement sensitivity and the certainty of measurement of measuring circuit.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram；
Fig. 2 is that the present invention measures current pulse signal schematic diagram；
Fig. 3 is i2 oscillogram of the present invention；
Fig. 4 is equivalent current oscillogram of the present invention.
As shown in Figures 1 to 4, magnetic core 1, armature winding the 2, first secondary windings 3, second subprime winding 4.
Detailed description of the invention
Below in conjunction with accompanying drawing and detailed description of the invention, the present invention is described in further detail:
In the prior art, 20mA electric current loop transport network interface circuit has been a kind of widely used circuit, and its great advantage is that low impedance transmission line is insensitive to electrical noise, it is very long easily to realize Phototube Coupling, transmission range.
Signal detection for 20mA electric current loop generally adopts current transformer.In existing measuring method, there is, when measuring DC pulse signal, the phenomenon that iron circuit is saturated in inductance type current transformer, reduces and measures sensitivity and the magnetic circuit saturation distortion of signal can occur, causes wave distortion；Based on the Zero flux current measurement circuit of Hall element, when measuring higher frequency signals, owing to signal intensity is fast, and the cancellation current that opposite direction is injected is due to the inductive obstacle Rapid Variable Design of electric current of coil, therefore also high-frequency signal can be produced wave distortion.
As shown in Figure 1, the structure of current transformer is relatively simple, it is made up of armature winding 2, first secondary windings 3 of mutually insulated, magnetic core 1 and framework, housing, binding post (not shown) etc., is all dielectrically separated between armature winding the 2, first secondary windings 3 and magnetic core 1.Its operation principle is essentially identical with transformator, and the number of turn of armature winding 2 is less, is directly series in power circuit, is series at the signal circuit of 20mA electric current loop in the present embodiment.When signal code i1 is by armature winding 2, the alternating flux sensing of generation produces the secondary current i3 reduced in proportion.The number of turn of the first secondary windings 3 is more, forms closed-loop path with the load in series of the current coil such as instrument, relay, transmitter.
In current transformer actual motion, load impedance is only small, and the first secondary windings 3, close to short-circuit condition, is equivalent to the transformator of a short circuit operation.
This constant amplitude DC pulse signal measuring circuit, magnetic core 1 is additionally provided with second subprime winding 4, accessing on second subprime winding 4 after DC current i2, this DC current i2 access needs the flow direction making second subprime winding 4 contrary with the flow direction of armature winding 2.
The DC current i2 amplitude of second subprime winding 4 is equal with the meansigma methods of the signal code i1 amplitude of armature winding 2.
As in figure 2 it is shown, there is DC component in signal code i1, this DC component can make magnetic core 1 magnetic circuit saturated thus producing wave distortion.
As it is shown on figure 3, the amplitude of the DC current i2 of second subprime winding 4 is equal with the meansigma methods of the signal code i1 amplitude of armature winding 2.
As shown in Figure 4, owing to adding the DC current i2 contrary with signal code i1 at second subprime winding 4, signal code i1 and DC current i2 is subtracted each other rear equivalence and becomes symmetrical pulse signal.
Do not produce remanent magnetism due to symmetrical pulse signal, therefore improve the working environment of constant amplitude DC pulse signal measuring circuit, improve the sensitivity of measuring circuit.
The demagnetization method of a kind of constant amplitude DC pulse signal measuring circuit, mainly comprises the steps:
Step 1, on magnetic core 1 primary winding wound the 2, first secondary windings 3, second subprime winding 4, first stimulate winding 3 L1、L2End is series at the signal circuit of 20mA electric current loop, the K of the first secondary windings 21、K2The load in series of the current coils such as end and instrument, relay, transmitter forms closed-loop path.
Step 2, on second subprime winding 4 apply a DC current i2, this DC current i2 and signal code i1 in opposite direction, make armature winding 2 contrary with the flow direction of second subprime winding 4.
As in figure 2 it is shown, there is DC component in signal code i1, this DC component can make magnetic core 1 magnetic circuit saturated thus producing wave distortion.
As it is shown on figure 3, the amplitude of the DC current i2 of second subprime winding 4 is equal with the meansigma methods of the signal code i1 amplitude of armature winding 2.
As shown in Figure 4, owing to adding the DC current i2 contrary with signal code i1 at second subprime winding 4, owing to the DC current i2 amplitude of second subprime winding 4 is equal with the meansigma methods of the signal code i1 amplitude of armature winding 2, signal code i1 and DC current i2 is subtracted each other rear equivalence and becomes symmetrical pulse signal.
Step 3, instrument obtains measured value from measuring.
A kind of constant amplitude DC pulse signal measuring circuit of the present invention and demagnetization method thereof, one independent solenoid is set, i.e. second subprime winding 4, when measuring electric current, contrary with measuring the sense of current, amplitude is passed to equal to the DC current measuring current average, the remanent magnetism that this additional DC current produces in former magnetic circuit for offset measurement electric current to secondary stage winding 4.So that primary inductance type current transformer or the working condition based on the Zero flux current measurement circuit of Hall element are improved, improve the sensitivity of former measuring circuit, this measuring circuit and demagnetization method can when low costs, efficiently reduce remanent magnetism and the wave distortion of measuring circuit when measuring DC pulse signal, thus improving measurement sensitivity and the certainty of measurement of measuring circuit.
As it has been described above, in conjunction with the plan content given by accompanying drawing, it is possible to derive similar technical scheme.In every case it is the content without departing from technical solution of the present invention, according to any simple modification, equivalent variations and modification that above example is made by the technical spirit of the present invention, all still falls within the scope of technical solution of the present invention.
Claims (8)
1. a constant amplitude DC pulse signal measuring circuit, it is characterized in that: the armature winding that include magnetic core, is arranged on magnetic core, the first secondary windings, described armature winding connects tested electric current, described first secondary windings connects measures instrument, is additionally provided with the second subprime winding that flow direction is contrary with armature winding on described magnetic core.
2. a kind of constant amplitude DC pulse signal measuring circuit according to claim 1, it is characterised in that: described second subprime winding accesses DC current.
3. a kind of constant amplitude DC pulse signal measuring circuit according to claim 2, it is characterised in that: the DC current amplitude of described second subprime winding is equal with the meansigma methods of the tested current amplitude of armature winding.
4. a kind of constant amplitude DC pulse signal measuring circuit according to claim 1, it is characterised in that: described tested electric current is 20mA current loop circuit signal.
5. the demagnetization method of the constant amplitude DC pulse signal measuring circuit as described in any one of Claims 1-4, it is characterised in that comprise the steps:
Step 1, constant amplitude DC pulse signal access armature winding；
Step 2, apply and armature winding electric current in opposite direction to second subprime winding；
Step 3, instrument obtains measured value from measuring.
6. the demagnetization method of a kind of constant amplitude DC pulse signal measuring circuit according to claim 5, it is characterised in that: in step 2, second subprime winding is contrary with the flow direction of armature winding.
7. the demagnetization method of a kind of constant amplitude DC pulse signal measuring circuit according to claim 5, it is characterised in that: in step 2, apply DC current to second subprime winding.
8. the demagnetization method of a kind of constant amplitude DC pulse signal measuring circuit according to claim 7, it is characterised in that: the DC current amplitude of second subprime winding is equal with the meansigma methods of the tested current amplitude of armature winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610256807.0A CN105785095A (en) | 2016-04-21 | 2016-04-21 | Constant-amplitude DC pulse signal measurement circuit and degaussing method thereof |
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| CN201610256807.0A CN105785095A (en) | 2016-04-21 | 2016-04-21 | Constant-amplitude DC pulse signal measurement circuit and degaussing method thereof |
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| CN201610256807.0A Pending CN105785095A (en) | 2016-04-21 | 2016-04-21 | Constant-amplitude DC pulse signal measurement circuit and degaussing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291407A (en) * | 2016-08-01 | 2017-01-04 | 国网河北省电力公司电力科学研究院 | A kind of transformator remanent magnetism detection, elimination integrated apparatus and using method thereof |
| CN111175577A (en) * | 2020-01-07 | 2020-05-19 | 云南铝业股份有限公司 | Method for detecting single-phase direct current resistance of in-phase and anti-parallel winding on secondary side of rectifier transformer |
| CN111999541A (en) * | 2020-09-10 | 2020-11-27 | 秦孝文 | Anti-magnetic disturbance integrated nondestructive current detection high-precision intelligent sensor probe |
| CN116298491A (en) * | 2023-05-11 | 2023-06-23 | 昆山迈致治具科技有限公司 | Pulse type direct current measurement method applied to backlight current detection of display screen |
| CN116643080A (en) * | 2023-05-11 | 2023-08-25 | 昆山迈致治具科技有限公司 | Pulse type direct current sampling and measuring device |
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| CN205656225U (en) * | 2016-04-21 | 2016-10-19 | 中车青岛四方机车车辆股份有限公司 | Invariable amplitude direct current pulse signal measuring circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291407A (en) * | 2016-08-01 | 2017-01-04 | 国网河北省电力公司电力科学研究院 | A kind of transformator remanent magnetism detection, elimination integrated apparatus and using method thereof |
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| CN111175577A (en) * | 2020-01-07 | 2020-05-19 | 云南铝业股份有限公司 | Method for detecting single-phase direct current resistance of in-phase and anti-parallel winding on secondary side of rectifier transformer |
| CN111999541A (en) * | 2020-09-10 | 2020-11-27 | 秦孝文 | Anti-magnetic disturbance integrated nondestructive current detection high-precision intelligent sensor probe |
| CN116298491A (en) * | 2023-05-11 | 2023-06-23 | 昆山迈致治具科技有限公司 | Pulse type direct current measurement method applied to backlight current detection of display screen |
| CN116643080A (en) * | 2023-05-11 | 2023-08-25 | 昆山迈致治具科技有限公司 | Pulse type direct current sampling and measuring device |
| CN116643080B (en) * | 2023-05-11 | 2023-11-10 | 昆山迈致治具科技有限公司 | Pulse type direct current sampling and measuring device |
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Application publication date: 20160720 |