CN204666711U - A kind of device measuring DC current - Google Patents
A kind of device measuring DC current Download PDFInfo
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- CN204666711U CN204666711U CN201520416006.7U CN201520416006U CN204666711U CN 204666711 U CN204666711 U CN 204666711U CN 201520416006 U CN201520416006 U CN 201520416006U CN 204666711 U CN204666711 U CN 204666711U
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- input end
- negative
- positive
- annular core
- peak
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- 238000007599 discharging Methods 0.000 claims abstract description 15
- 230000000737 periodic effect Effects 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 4
- 230000005284 excitation Effects 0.000 abstract description 5
- 230000004907 flux Effects 0.000 description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
Abstract
The utility model provides a kind of device measuring DC current, and a winding is through annular core T
1, annular core T
2; Annular core T
1upper coiling magnetizing coil N
1; Annular core T
2upper coiling magnetizing coil N
2with magnetic test coil N
3; Magnetizing coil N
1, N
2the two ends in AC regulating voltage source are connected in series in by Same Name of Ends reversal connection; Magnetic test coil N
3two ends be connected with two input ends of buffer amplifier respectively; The output terminal of buffer amplifier is connected with the input end of positive half-wave peak detector, the negative input end of half-wave peak detector, the input end of periodic discharging circuit respectively; Two output terminals of periodic discharging circuit respectively with positive half-wave peak detctor and, the control end of negative half peak detector is connected, the time to peak difference of the distorted voltage utilizing magnetic test coil to respond to measure DC current, effectively can improve measuring accuracy in the accounting of fixing AC mains cycle; Thus the requirement reduced excitation power supply, its principle is simple and reliable.
Description
Technical field
The utility model relates to DC current measurement field, is specifically related to a kind of device measuring DC current.
Background technology
At present, more direct current instrument transformer mainly Zero flux mutual inductor and photo-electricity mutual-inductor is applied in actual DC current conversion station.Wherein, Zero flux mutual inductor can adopt single iron core open loop or closed loop configuration, also can adopt double-iron core open loop or closed loop configuration.All there is drive coil in Open loop and closed loop structure, when mutual inductor normally works, the magnetic flux distorted in iron core can produce distorted voltage at energized circuit, thus makes energized circuit form the current sinusoidal ripple of distortion, adds the difficulty of detection.Based on this, be necessary to invent a kind of new direct current detection device, to solve the problem of energized circuit current distortion, improve the degree of accuracy detected.
Utility model content
The utility model provides a kind of device measuring DC current according to the deficiencies in the prior art, solves energized circuit current distortion in existing direct current measuring devices, the problem that accuracy of measurement is low.
The technical solution of the utility model: a kind of device measuring DC current, it is characterized in that: comprise two identical annular cores of parameter, AC regulating voltage source, buffer amplifier, positive half-wave peak detctor, negative half peak detector, periodic discharging circuit, wherein, a winding is through annular core T
1, annular core T
2; Annular core T
1upper coiling magnetizing coil N
1; Annular core T
2upper coiling magnetizing coil N
2with magnetic test coil N
3; Magnetizing coil N
1, N
2the two ends in AC regulating voltage source are connected in series in by Same Name of Ends reversal connection; Magnetic test coil N
3two ends be connected with two input ends of buffer amplifier respectively; The output terminal of buffer amplifier is connected with the input end of positive half-wave peak detector, the negative input end of half-wave peak detector, the input end of periodic discharging circuit respectively; Two output terminals of periodic discharging circuit respectively with positive half-wave peak detctor and, the control end of negative half peak detector is connected.
Also comprise positive and negative time to peak difference operator and display; The output terminal of positive half-wave peak detctor is connected with an input end of positive and negative time to peak difference operator; The output terminal of negative half peak detector is connected with another input end of positive and negative time to peak difference operator; The positive and negative output terminal of time to peak difference operator is connected with the input end of display.
Technique effect of the present utility model: the time to peak difference of the distorted voltage utilizing magnetic test coil to respond in the accounting of fixing AC mains cycle to measure DC current, it is a kind of brand-new device, enrich existing Zero flux mutual inductor measuring principle, compared with single iron core magnetic modulator, a kind of device measuring DC current described in the utility model eliminates the impact of the magnetic potential in magnetic core on energized circuit, make energized circuit produce complete sine wave, effectively can improve measuring accuracy; With general Zero flux transformer request excitation power supply without making compared with magnetic core is near saturation point during a direct current, a kind of direct current measuring devices described in the utility model requires that ac-excited voltage source makes magnetic core be in state of saturation when a nothing direct current, thus the requirement reduced excitation power supply, the utility model provides a kind of device measuring DC current, and its principle is simple and reliable.Be applicable to generating, distribution and plating electrolysis production on-the-spot, and other need the place measuring DC current.
Accompanying drawing explanation
Fig. 1 is the utility model measurement mechanism one-piece construction schematic diagram.
In figure, 1-toroidal core T
1, 2-toroidal core T
2, 3-AC regulating voltage source, 4-buffer amplifier, 5-positive half-wave peak detctor, 6-bears half peak detector, 7-periodic discharging circuit, the positive and negative time to peak difference operator of 8-, 9-display; I
1represent a tested DC current, N
1represent and be wound on toroidal core T
2on drive coil, N
2represent and be wound on toroidal core T
1on drive coil, N
3represent and be wound on toroidal core T
2on magnetic test coil, I
2represent the alternating current of energized circuit, U
mrepresent the induced voltage of magnetic test coil, φ
1represent magnetic core T
1in magnetic flux, φ
2represent magnetic core T
2in magnetic flux.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further illustrated:
As shown in Figure 1, a kind of device measuring DC current, is characterized in that: comprise two identical annular core T of parameter
1, T
2, AC regulating voltage source 3, buffer amplifier 4, positive half-wave peak detctor 5, negative half peak detector 6, periodic discharging circuit 7, wherein, a winding is through annular core T
11, annular core T
22; Annular core T
1coiling magnetizing coil N on 1
1; Annular core T
2coiling magnetizing coil N on 2
2with magnetic test coil N
3; Magnetizing coil N
1, N
2the two ends in AC regulating voltage source 3 are connected in series in by Same Name of Ends reversal connection; Magnetic test coil N
3two ends be connected with two input ends of buffer amplifier 4 respectively; The output terminal of buffer amplifier 4 is connected with the input end of positive half-wave peak detector 5, the negative input end of half-wave peak detector 6, the input end of periodic discharging circuit 7 respectively; Two output terminals of periodic discharging circuit 7 are connected with the control end of positive half-wave peak detctor and 5, negative half peak detector 6 respectively.
Also comprise positive and negative time to peak difference operator 8 and display 9; The output terminal of positive half-wave peak detctor 5 is connected with an input end of positive and negative time to peak difference operator 8; The output terminal of negative half peak detector 6 is connected with another input end of positive and negative time to peak difference operator 8; The output terminal of positive and negative time to peak difference operator 8 is connected with the input end of display 9.
During work, AC regulating voltage source output AC modulation voltage produces the phase place exchange flux identical with size in two identical toroidal cores of parameter, and the maximal value of AC regulating voltage is stabilized in that toroidal core is in is saturated.Under two magnetic cores are in identical magnetic potential, thus its induced voltage is identical, due in energized circuit, to be that Same Name of Ends is anti-phase be connected in series, thus, in energized circuit for two magnetic cores, the induced voltage sum of two drive coils is zero, thus ensure that energized circuit not by the impact of flux change in magnetic core, under the effect of the ac-excited power supply of forward, energized circuit produces complete sinusoidal current.Be loaded with the wire of measured DC through two magnetic cores.When measured DC is zero, only exchange flux is there is in magnetic core, maximal value due to AC regulating voltage has made magnetic core reach capacity, therefore the induced voltage of magnetic test coil is the distorted voltage of positive and negative half-wave full symmetric, now, the time interval between adjacent positive negative peak accounts for ac modulation power cycle
and when measured DC is greater than zero, the magnetic potential that measured DC produces makes to produce direct current flux in toroidal core.Direct current flux and exchange flux superimposed, the quiescent point of magnetic core is produced just offset, the interchange magnetic potential that now energized circuit produces enters saturated at positive half-wave in advance, and the size of AC regulating voltage that the negative half-wave of interchange magnetic potential is not yet exited at this moment is saturated, the time interval between the positive negative peak thus now detected will be less than
and along with the increase of DC current, the time interval between positive negative peak can reduce.Thus, the induced voltage of magnetic test coil is via after buffer amplifier, input positive half-wave peak detctor and negative half peak detector on the one hand, positive half-wave peak detctor and negative half peak detector detect the positive half-wave time to peak point of induced voltage and negative half-wave time to peak point respectively; On the other hand, input periodic discharging circuit, periodic discharging circuit each cycle sends a discharge pulse, discharge pulse makes each periodic discharging of point electric capacity of positive half-wave peak detctor and negative half peak detector once, to guarantee that output each cycle of positive half-wave peak detctor and negative half peak detector upgrades once.Then, carry out computing according to the positive half-wave time to peak point of induction voltage waveform and negative half-wave time to peak point, obtain the time interval between adjacent positive negative peak, and this time interval accounts for the ratio of an ac modulation power cycle, this ratio is less than
and be inversely proportional to the size of a DC current, the size of measured DC can be calculated thus.
During concrete enforcement, two magnetic cores being wound with drive coil adopt high permeability, the magnetic material of low-coercivity is made, ac-excited coil N
1at annular core T
1on be uniformly distributed, ac-excited coil N
2with magnetic test coil N
3at toroidal core T
2on be uniformly distributed, and ensure N
1, N
2the number of turn strictly equal.AC regulating voltage source 3 adopts the voltage source being adjusted to appropriate voltage by civil power transformer or the voltage source produced by direct supply oscillatory circuit.Display 9 adopts common pointer instrument or read out instrument.
A kind of device measuring DC current of the present utility model, the time to peak difference of the distorted voltage utilizing magnetic test coil to respond in the accounting of fixing AC mains cycle to measure DC current, it is a kind of brand-new device, enrich existing Zero flux mutual inductor measuring principle, compared with single iron core magnetic modulator, a kind of device measuring DC current described in the utility model eliminates the impact of the magnetic potential in magnetic core on energized circuit, make energized circuit produce complete sine wave, effectively can improve measuring accuracy; With general Zero flux transformer request excitation power supply without making compared with magnetic core is near saturation point during a direct current, a kind of direct current measuring devices described in the utility model requires that ac-excited voltage source makes magnetic core be in state of saturation when a nothing direct current, thus the requirement reduced excitation power supply, the utility model provides a kind of device measuring DC current, and its principle is simple and reliable.Be applicable to generating, distribution and plating electrolysis production on-the-spot, and other need the place measuring DC current.
Claims (2)
1. measure the device of DC current for one kind, it is characterized in that: comprise two identical annular cores of parameter (1,2), AC regulating voltage source (3), buffer amplifier (4), positive half-wave peak detctor (5), negative half peak detector (6), periodic discharging circuit (7), wherein, a winding is through annular core T
1(1), annular core T
2(2); Annular core T
1(1) upper coiling magnetizing coil N
1; Annular core T
2(2) upper coiling magnetizing coil N
2with magnetic test coil N
3; Magnetizing coil N
1, N
2the two ends of AC regulating voltage source (3) are connected in series in by Same Name of Ends reversal connection; Magnetic test coil N
3two ends be connected with two input ends of buffer amplifier (4) respectively; The output terminal of buffer amplifier (4) is connected with the input end of positive half-wave peak detector (5), the negative input end of half-wave peak detector (6), the input end of periodic discharging circuit (7) respectively; Two output terminals of periodic discharging circuit (7) are connected with the control end of positive half-wave peak detctor with (5), negative half peak detector (6) respectively.
2. a kind of device measuring DC current according to claim 1, is characterized in that: also comprise positive and negative time to peak difference operator (8) and display (9); The output terminal of positive half-wave peak detctor (5) is connected with an input end of positive and negative time to peak difference operator (8); The output terminal of negative half peak detector (6) is connected with another input end of positive and negative time to peak difference operator (8); The output terminal of positive and negative time to peak difference operator (8) is connected with the input end of display (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520416006.7U CN204666711U (en) | 2015-06-16 | 2015-06-16 | A kind of device measuring DC current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520416006.7U CN204666711U (en) | 2015-06-16 | 2015-06-16 | A kind of device measuring DC current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204666711U true CN204666711U (en) | 2015-09-23 |
Family
ID=54137081
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520416006.7U Active CN204666711U (en) | 2015-06-16 | 2015-06-16 | A kind of device measuring DC current |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914289A (en) * | 2015-06-16 | 2015-09-16 | 国家电网公司 | Device for measuring direct current and method |
| CN113341201A (en) * | 2021-06-08 | 2021-09-03 | 合肥博微田村电气有限公司 | Fluxgate current sensor and current measuring method |
| CN116953335A (en) * | 2023-09-20 | 2023-10-27 | 盛位科技(合肥)有限公司 | Device and method for detecting direct current signal or magnetic field |
-
2015
- 2015-06-16 CN CN201520416006.7U patent/CN204666711U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914289A (en) * | 2015-06-16 | 2015-09-16 | 国家电网公司 | Device for measuring direct current and method |
| CN104914289B (en) * | 2015-06-16 | 2017-03-08 | 国家电网公司 | A kind of method of measurement DC current |
| CN113341201A (en) * | 2021-06-08 | 2021-09-03 | 合肥博微田村电气有限公司 | Fluxgate current sensor and current measuring method |
| CN113341201B (en) * | 2021-06-08 | 2022-08-09 | 合肥博微田村电气有限公司 | Fluxgate current sensor and current measuring method |
| CN116953335A (en) * | 2023-09-20 | 2023-10-27 | 盛位科技(合肥)有限公司 | Device and method for detecting direct current signal or magnetic field |
| CN116953335B (en) * | 2023-09-20 | 2024-01-12 | 盛位科技(合肥)有限公司 | Device and method for detecting direct current signal or magnetic field |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |