CN103105593B - Novel cross-core type sensor - Google Patents
Novel cross-core type sensor Download PDFInfo
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- CN103105593B CN103105593B CN201310042133.0A CN201310042133A CN103105593B CN 103105593 B CN103105593 B CN 103105593B CN 201310042133 A CN201310042133 A CN 201310042133A CN 103105593 B CN103105593 B CN 103105593B
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Abstract
The invention relates to a novel cross-core type sensor. A ring-shaped magnetic core of the sensor is arranged in an outer shell, two sets of reversed coils are wound on the magnetic core so as to form a reversed transformer, I and II are the first set of coils, and III and IV are the second set of coils. The end I and the end III of the reversed transformer receive square waves generated from a self-oscillation circuit, the output end II and the output end IV of the reversed transformer are connected with a difference channel, output signals of the difference circuit are sensor collection signals, the II and the IV of the reversed transformer are respectively connected with a first voltage-to-digital converter (VDC) and a second VDC through a current-limiting resistor, the current-limiting resistor is adjustable and capable of changing current in the coils, and therefore square wave frequency is changed, and collection frequency of the sensor mainly depends on turns per coil, namely n. The cross-core type sensor can collect signals of alternating current and direct current, sampling frequency can be adjusted through the turns per coil, and the range of the frequency is from 0 KHZ to dozens of KHZ.
Description
Technical field
The present invention relates to a kind of sensor, particularly a kind of cross-core type sensor.
Background technology
It is a kind of method of very practical also very science that application magnetic saturation cross-core type sensor is measured by the method in the magnetic field in annulus.The ultimate principle of this sensor utilizes Ferrari electromagnetic induction principle and magnetic saturation phenomenon.First be utilize Ferrari electromagnetic induction principle, the magnetic field that the surrounding of electrified wire produces, the annulus of electrified wire through sensor, the magnetic field that wire produces can sense on the coil of transformer.Secondly the transformer on annulus creates square wave due to magnetic saturation phenomenon, and magnetic field made the square-wave waveform of output change after entering transformer coil, signal can be sensed, square-wave waveform is distorted, this distortion is regular, that is can be measured the size of current on electrified wire by this rule.Transformer both sides export square wave through difference, obtain a very smart metastable signal.
But the sensor of design now can not gather alternating current-direct current signal simultaneously, and can only gather interchange or direct current, the frequency gathered in addition is placed restrictions on.
Summary of the invention
The present invention be directed to sensor can not simultaneously to the problem of alternating current-direct current signals collecting, and propose a kind of cross-core type sensor, this sensor frequency is adjustable, applied range.
Technical scheme of the present invention is: a kind of cross-core type sensor, the toroidal core of sensor is placed in shell, magnetic core is wound with two groups of reverse windings and forms reverse transformer, I, II input end and the output terminal being respectively first group of coil, III, IV input end and the output terminal being respectively second group of coil, reverse transformer I, III termination self-maintained circuit produces square wave, II of reverse transformer, IV end exports and connects difference channel, difference channel output signal is sensor collection signal, reverse transformer II, IV end respectively meets 12VDC by a current-limiting resistance, current-limiting resistance is adjustable.
Described self-maintained circuit is made up of two comparers.
Described shell selects the resistant to elevated temperatures epoxide resin material of antidetonation.
Beneficial effect of the present invention is: cross-core type sensor of the present invention, can gather two kinds of signals of AC and DC, and the frequency of sampling can be regulated through row by coil turn, frequency range 0 to tens KHZ.
Accompanying drawing explanation
Fig. 1 is cross-core type sensor structural representation of the present invention;
Fig. 2 is cross-core type sensor circuit diagram of the present invention;
Fig. 3 is the transformer both sides output signal diagram of cross-core type sensor of the present invention sensor when inner through toroidal cores without any electric current;
Fig. 4 sensor output signal that is cross-core type sensor of the present invention when inner through toroidal cores without any electric current is through differentiated oscillogram;
Fig. 5 is the transformer both sides output signal diagram of cross-core type sensor of the present invention sensor when there being electric current to pass toroidal cores inside;
Fig. 6 is the cross-core type sensor of the present invention oscillogram that sensor output signal obtains after difference when there being electric current to pass toroidal cores inside.
Embodiment
The toroidal core 2 of sensor is placed in shell 5 as shown in Figure 1, magnetic core 2 is wound with two groups of reverse windings and forms reverse transformer 3, circuit diagram as shown in Figure 2, I, II is first group of coil, III, IV is second group of coil, reverse transformer 3 I, III connects self-maintained circuit 1, and II, IV end of reverse transformer exports and connects difference channel 4, and the reverse transformer II, IV of self-maintained circuit 1 connecting coil generation square wave exports.The signal exchanged that difference channel 4 exports is exactly the signal that sensor collects.The shell 5 resistant to elevated temperatures material epoxy resin of antidetonation, so it is not its stability is strong, fragile.
The reverse transformer 3 of two groups of reverse winding compositions on the annulus magnetic core 2 of sensor, must combine and could use with self-maintained circuit 1, when transformer I or III produces excitation field, periodic excitation is carried out to primary side, make the state that periodically reaches capacity of sensor, voltage drop time saturated, the other end II, IV must overturn and could produce square wave, so will use the self-maintained circuit of two comparer compositions.
Reverse transformer 3 is powered by 12VDC, and II, IV all meets 12VDC, and centre is connected to current-limiting resistance R45 and R53, can electric current in regulating winding, thus changes square wave frequency.The frequency acquisition of sensor is mainly decided by coil turn n, such as the square wave frequency that during 80 circle, sensor produces is 300Hz, and so collection period is just more accurate at 0-150Hz.
The frequency of the drive coil of sensor is
f e excitation cycle electric current
i e , the magnetic core 2 of sensor is periodically reached capacity state, and according to soft magnetic material self-characteristic, the magnetic induction density signal of the magnetic core 2 of sensor is the function about the time by permeability modulation, the magnetic induction density signal that pumping signal is transferred to
, the pulse signal that inductive coil induces
, N
2be the number of turn of inductive coil and field coil N
1=N
2, the xsect of S magnetic core.The coil ratio of the transformer of sensor is 1:1, and the signal that their export is the signal of a pair complementation, as shown in Figure 3 the transformer both sides output signal diagram of sensor when inner through toroidal cores without any electric current.The waveform that these two signals export after difference is as Fig. 4.So just very understand sensor final output signal.
When the annular magnet in-core of sensor exists a field signal
h x time, to the frequency of drive coil be equally
f e excitation cycle electric current
i e , sensor magnetic core is periodically reached capacity state, now the magnetic induction signal of permeability modulation
be in magnetic saturation state and, but inductive impulse signal
for incomplementarity symmetric signal, as shown in Figure 5 have electric current pass toroidal cores inner time sensor transformer both sides output signal diagram.These two signals are after the influence of magnetic field that is subject in magnetic core of sensor, the change of generation.Now, if the direction of this externally-applied magnetic field is inwards, so waveform upwards moves, and its effective value increases.If the direction of this externally-applied magnetic field is outside, so waveform is to moving down, and it is effectively also increase, and is exactly that direction is different.So this illustrates again can gather interchange or direct current signal, because its effective value is all in increase.So just can reach the object measuring magnetic field size, know the value needing the size of current measured afterwards.As Fig. 6 outputs signal the waveform that exports after difference as figure.
Claims (3)
1. a cross-core type sensor, it is characterized in that, the toroidal core of sensor is placed in shell, magnetic core is wound with two groups of reverse windings and forms reverse transformer, I, II is respectively input end and the output terminal of first group of coil, III, IV input end and the output terminal being respectively second group of coil, reverse transformer I, III termination self-maintained circuit produce square wave, II, IV end of reverse transformer exports and connects difference channel, difference channel output signal is sensor collection signal, reverse transformer II, IV end respectively meets 12VDC by a current-limiting resistance, and current-limiting resistance is adjustable.
2. cross-core type sensor according to claim 1, it is characterized in that, described self-maintained circuit is made up of two comparers.
3. cross-core type sensor according to claim 1, it is characterized in that, described shell selects the resistant to elevated temperatures epoxide resin material of antidetonation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310042133.0A CN103105593B (en) | 2013-02-04 | 2013-02-04 | Novel cross-core type sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310042133.0A CN103105593B (en) | 2013-02-04 | 2013-02-04 | Novel cross-core type sensor |
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| CN103105593A CN103105593A (en) | 2013-05-15 |
| CN103105593B true CN103105593B (en) | 2015-02-11 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109212304A (en) * | 2018-11-01 | 2019-01-15 | 东北电力大学 | The detection method of digital Weak current alternating current-direct current sensor based on direct current carrier communication technology |
| CN110824229B (en) * | 2019-11-12 | 2022-04-19 | 中国船舶重工集团公司第七一九研究所 | Single-magnetic-core multi-winding magnetic balance type current detection device |
| CN110927428B (en) * | 2019-11-12 | 2022-03-08 | 中国船舶重工集团公司第七一九研究所 | Wide-range wide-band high-precision magnetic balance type current measuring device |
| CN112152328B (en) * | 2020-10-13 | 2022-04-22 | 内蒙古旭坤电子科技有限公司 | Single wire power supply and signal transmission device |
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| CN1712973A (en) * | 2004-06-21 | 2005-12-28 | Abb服务有限公司 | Device for the reading of direct and/or alternating currents |
| CN201397357Y (en) * | 2009-04-07 | 2010-02-03 | 绵阳市维博电子有限责任公司 | Wide-aperture direct current leakage current detection sensor |
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|---|---|---|---|---|
| JPH11248754A (en) * | 1998-03-02 | 1999-09-17 | Omron Corp | Dc current sensor and solar inverter using it |
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| US6316931B1 (en) * | 1998-12-15 | 2001-11-13 | Tdk Corporation | Magnetic sensor apparatus and current sensor apparatus |
| CN2405230Y (en) * | 1999-07-22 | 2000-11-08 | 林辉 | Front end tester for device locating earth-fault in dc system |
| CN1712973A (en) * | 2004-06-21 | 2005-12-28 | Abb服务有限公司 | Device for the reading of direct and/or alternating currents |
| CN201397357Y (en) * | 2009-04-07 | 2010-02-03 | 绵阳市维博电子有限责任公司 | Wide-aperture direct current leakage current detection sensor |
| CN201465792U (en) * | 2009-06-01 | 2010-05-12 | 丽水电业局 | Feed through micro-current transformer |
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Inventor after: Cheng Guomiao Inventor after: Qian Weikang Inventor after: Qi Jinbiao Inventor after: Xie Ming Inventor after: Ji Shuangshuang Inventor after: Wang Minhua Inventor before: Cheng Guomiao Inventor before: Qian Weikang Inventor before: Xie Ming Inventor before: Ji Shuangshuang Inventor before: Wang Minhua |
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