CN200983314Y - PCB hollow coil current sensor - Google Patents
PCB hollow coil current sensor Download PDFInfo
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- CN200983314Y CN200983314Y CN 200620052659 CN200620052659U CN200983314Y CN 200983314 Y CN200983314 Y CN 200983314Y CN 200620052659 CN200620052659 CN 200620052659 CN 200620052659 U CN200620052659 U CN 200620052659U CN 200983314 Y CN200983314 Y CN 200983314Y
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Abstract
The utility model discloses a printed circuit board type air-core coil current sensor which is provided with one-layer or multi-layer printed circuit boards, wherein each layer of the printed circuit board is provided with over 4 even number identical flat helical windings which are in symmetrical distribution. The helical windings which are positioned between the layers are in series connection consecutively, and are connected by vias, then a head end and an end are taken as the output ends to form a secondary coil, while a primary coil tightly winds the half helical windings which are not adjacent to each other in each layer to form a one-turn or multi-turn loop. The utility model is capable of avoiding extraneous electromagnetic interference, and the secondary coil is capable of responding to the current through the primary coil sensitively to generate the voltage signal in proportion to the change rate of the measured current. The utility model has very good linearity, high measurement accuracy and strong ability of anti-electromagnetic interference, and adapts to be used as the current sensor in electronic electric energy meter, microcomputer protection, and measuring device.
Description
Technical field
Utility model relates to a kind of current sensor, particularly a kind of PCB type hollow coil current-sensing device.
Background technology
Current sensor commonly used is measured electric current in electronic electric energy meter and the relay microcomputer protective device, and used current sensor has the main small-sized mutual device device of electromagnetic type electric current, small resistor current bypass transducer device and hall effect sensor.Electromagnetic current transducer is when measuring very big or very little electric current, because the influence of exciting current can produce bigger numerical error and phase angle error.In addition, the Ferrite Material that iron core uses can be saturated under big electric current, and iron core also can produce hysteresis after the magnetization, unless degaussing again, precision will descend.When the therefore small-sized mutual device device of electromagnetic type electric current was used as current measurement, its certainty of measurement was lower, and when especially electric current was excessive or too small, measure error was big, and was subject to the influence of outside electromagnetic interference.
Small resistor current bypass technology can obtain degree of precision with lower cost, and the measurement of electric current is also very simple.When carrying out the high-precision current measurement, need to consider the stray inductance of bypass, this inductance value representative value is several nH, it will influence the amplitude of bypass impedance when frequency is higher.Even but it is still very big under the power frequency condition to the influence of phase place, power factor (PF) can produce obvious errors when low; And this technology produces heat and tested electric current and establishes because of bypass resistance and lacks electric current isolation sustain damage between the voltage, and especially in the Super-Current Measurement, self-heating is more serious.
Hall effect sensor has two kinds of main types, i.e. open loop type and closed-loop type, and the most Hall elements that use in the electric energy meter all adopt the design of open loop type to reduce system cost.Hall element has outstanding frequency response characteristic, can measure very large electric current.But the Hall element temperature influence is big, costs an arm and a leg, and is subject to outside electromagnetic interference.
Therefore, all there are a lot of deficiencies in above current sense technology, more prior is the interference that they all are subject to external magnetic field, and this magnetic field may be that the alternating magnetic field (uniform magnetic field) that produces of far-end or the electric current that is positioned near the lead the current sensor by flowing through are produced.Current sensor the particularly important is during as the occasion of charge electric energy meter metering, can not tetchiness in the influence of external magnetic field.
The utility model content
For solving the existing problem that the existing precision of current sensor is low, antijamming capability is low, utility model provides a kind of simple in structure, the linearity is high, antijamming capability is strong PCB type hollow coil current-sensing device.
The technical scheme that utility model solves the problems of the technologies described above is: be provided with one or more layers PCB circuit board, every layer of pcb board is provided with the identical planar spiral winding of even number more than 4, helical coil on every pcb board is symmetrically distributed, every layer of adjacent helical coil is connected in series successively, the layer with layer between helical coil be connected by via hole, two terminations of first and last constitute secondary coil as output; Primary winding tightly constitutes a circle or multiturn loop around every layer of half helical coil not adjacent to each other.
In the above-mentioned PCB type hollow coil current-sensing device, described secondary helical coil pursues any in the rectangle, circle, 1/4 circle and the triangle that increase for size is even, and corresponding secondary helical coil is coaxial between layer and the layer.
In the above-mentioned PCB type hollow coil current-sensing device, described primary winding is gone up half helical coil not adjacent to each other around every layer of PCB and directly is printed on the PCB, or is embedded on the PCB with electric conductor in addition.
In the PCB type hollow coil current-sensing device of the above, last corresponding helical coil of all layers of described PCB and secondary helical coil are coaxial.
A kind of PCB type hollow coil current-sensing device, be provided with one or more layers PCB circuit board, be respectively equipped with the identical planar spiral winding of even number more than 4 on pcb board part layer or all layers, helical coil on every pcb board is symmetrically distributed, every layer of adjacent helical coil is connected in series successively, layer is connected by via hole with helical coil on the layer, and two terminations of first and last are as output, the formation secondary coil; Around the nested making of each a secondary helical coil helical coil identical with its shape, every layer of adjacent helical coil is connected in series the formation primary winding successively, the layer with layer between a helical coil be connected by via hole, two terminations of first and last are as tested current input terminal.
In the above-mentioned PCB type hollow coil current-sensing device, a described helical coil, secondary helical coil are size evenly by in the rectangle, circle, 1/4 circle and the triangle that increase any, and the secondary helical coil is coaxial accordingly between layer and the layer.
In the above-mentioned PCB type hollow coil current-sensing device, described primary winding is gone up each secondary helical coil around every layer of PCB and directly is printed on the PCB.
In the above-mentioned PCB type hollow coil current-sensing device, last corresponding helical coil of all layers of described PCB and secondary helical coil are coaxial.
The technique effect of utility model: 1) this hollow coil current-sensing device adopts air core coil, does not have ferromagnetic material, can not have the very high linearity because of tested electric current is big and saturated, and bandwidth; 2) this hollow coil current sensing adopts a plurality of equally distributed sensor coils to compose in series, induced electromotive force equal and opposite in direction, direction that external interference magnetic field is produced between adjacent windings are opposite, final serial connection is cancelled out each other, having played disturbing magnetic field does not to external world have the effect of response, do not need to add electro-magnetic screen layer in addition, and guaranteed certainty of measurement; 3) this hollow coil current-sensing device can adopt PCB to make, and can significantly reduce cost, manufacture craft is meticulous, be convenient to produce in batches, and temperature influence is little, also be convenient to electronic electric energy meter and microcomputer protecting device in electronic circuit integrated.
Below in conjunction with the drawings and specific embodiments utility model is further described.
Description of drawings
Fig. 1 is the loop construction schematic diagram of the utility model embodiment 1 top layer.
Fig. 2 is the loop construction schematic diagram of the utility model embodiment 1 bottom.
Fig. 3 responds the schematic diagram of tested electric current for the utility model sensor coil.
The disturbing magnetic field that Fig. 4 produces near the relatively big electric current of the utility model does not have the schematic diagram of response.
Fig. 5 is the loop construction schematic diagram of the utility model embodiment 2 top layers.
Fig. 6 is the structural representation of the utility model embodiment 3
Embodiment
Referring to Fig. 1, Fig. 1 is the winding diagram on the PCB current sensor top layer, and 9,10,11,12 are PCB goes up the helical coil that track constitutes, and they tightly evenly distribute around a center; 1,2,3,4 via holes that are on the PCB connect the levels helical coil, and 13 is the output (the secondary output of PCB type hollow coil current-sensing device) of sensor coil.When the alternating magnetic field of far-end generation interference passed the sensor coil of this layer, 9 is opposite with induced electromotive force equal and opposite in direction, the direction of 11 liang of helical coils generations, cancels out each other thereby be connected in series, and 10 and 12 induced electromotive forces that produce also can be cancelled out each other equally.
Fig. 2 has shown the winding diagram on the above-described PCB current sensor bottom, and same 5,6,7,8 are PCB goes up the helical coil that track constitutes, tightly evenly distribute around a center, more than two centers be essentially same center.When the time-varying magnetic field of far-end generation interference vertically passed the sensor coil of this layer of Fig. 2,5 is opposite with induced electromotive force equal and opposite in direction, the direction of 6 liang of helical coils generations, cancels out each other thereby be connected in series, and 7 and 8 induced electromotive forces that produce also can be cancelled out each other equally.When the external interference magnetic field levels was passed above-mentioned sensor coil, sensor coil was non-inductive.
Among Fig. 4,15,16,17 are near the conductor the above-described PCB current sensor, and can pass through big electric current.When passing to alternating current in the conductor 15, transducer produces the alternating magnetic field that disturbs relatively, and helical coil 5 is opposite with 6 induced electromotive force equal and opposite in direction, the directions that produce because of this disturbing magnetic field, and serial connection is cancelled out each other, and same 7 and 8 consequent induced electromotive forces also can be cancelled out each other.When passing to alternating current in the conductor 16, produce disturbing magnetic field, small coil 5 is opposite with 7 induced electromotive force equal and opposite in direction, the directions that produce because of this disturbing magnetic field, and serial connection is cancelled out each other, and same 6 and 8 consequent induced electromotive forces also can be cancelled out each other.When passing to alternating current in the conductor 17, produce disturbing magnetic field, 5 is identical with the 8 induced electromotive force directions that produce because of this disturbing magnetic field, 6 is identical with the 7 induced electromotive force directions that produce because of this disturbing magnetic field, and 5,8 and 6, the 7 induced electromotive force directions that produce because of this disturbing magnetic field are opposite, what electric current produced in the straight again lead 17 is a linear gradient magnetic field, 5,8 induced electromotive force sums and 6,7 induced electromotive force sum equal and opposite in directions that produce because of this disturbing magnetic field so because of this disturbing magnetic field generation, direction is opposite, and final serial connection is cancelled out each other.Equally, 9,10,11,12 helical coils also can be offset fully because of the induced electromotive force that near current interference produces.
Therefore, above-described PCB hollow coil current-sensing device to external world electromagnetic interference do not have response.
Fig. 3 has shown the schematic diagram of electric current in the former conductor of above-described PCB current sensor measurement.14 is former conductor (by tested electric current), and 18 is the import and export of tested electric current.Its Central Plains conductor generally is made into as shown in the figure annular with the copper material of certain thickness and width, is embedded on the PCB.Former conductor also can be directly be produced on the PCB by the track of broad.PCB can arrange former conductor up and down, and the annular of former conductor has variously, and 14 only for wherein preferably a kind of; PCB also can be made into multi-layer sheet, increases the total number of turns of sensor coil.When passing through tested alternating current in the former conductor, the induced electromotive force direction that all helical coils of this layer of PCB (upper strata) (9,10,11,12) produce is identical, the induced electromotive force direction that the helical coil (5,6,7,8) of same PCB bottom produces is also identical, and the induced electromotive force direction that above helical coil all in two-layer produces is all identical, the serial connection mutual superposition is by sensor coil output 13 one of output and tested electric current corresponding voltage signal.
31 is the former conductor of PCB hollow coil current-sensing device among Fig. 5, and 32 is its secondary coil, and the vertical view of whole sensor coil is circular substantially.
Among Fig. 6,41,42 are respectively the primary winding and the secondary coil of PCB current sensor.Primary winding 41 is printed on the ground floor of PCB, and secondary coil 42 is printed on the second layer of PCB.The 3rd layer of PCB go up the helical coil printed among similar Fig. 2, and be connected with primary winding on the PCB ground floor by via hole 34,36,37,39 as primary winding.The 4th layer of PCB go up the helical coil printed among similar Fig. 2, and be connected with secondary coil on the PCB second layer by via hole 33,35,38,40 as secondary coil.Helical coil and secondary helical coil also can be printed on the identical layer of PCB.According to this method, primary winding and secondary coil can not be subjected to the influence of outside electromagnetic interference, can also increase more layer, or serial connection polylith PCB, increase its coefficient of mutual inductance.
Claims (7)
1, a kind of PCB type hollow coil current-sensing device, it is characterized in that: be provided with one or more layers PCB circuit board, every layer of pcb board is provided with the identical planar spiral winding of even number more than 4, helical coil on every pcb board is symmetrically distributed, every layer of adjacent helical coil is connected in series successively, layer is connected by via hole with helical coil between the layer, and two terminations of first and last are as output, the formation secondary coil; Primary winding tightly constitutes a circle or multiturn loop around every layer of half helical coil not adjacent to each other.
2, PCB type hollow coil current-sensing device according to claim 1, it is characterized in that: described secondary helical coil pursues any in the rectangle, circle, 1/4 circle and the triangle that increase for size is even, and corresponding secondary helical coil is coaxial between layer and the layer.
3, PCB type hollow coil current-sensing device according to claim 1 is characterized in that: described primary winding directly is printed on PCB around the last half helical coil not adjacent to each other of every layer of PCB and goes up or be embedded on the PCB with electric conductor in addition.
4, a kind of PCB type hollow coil current-sensing device, it is characterized in that: be provided with one or more layers PCB circuit board, be respectively equipped with the identical planar spiral winding of even number more than 4 on pcb board part layer or all layers, helical coil on every layer of pcb board is symmetrically distributed, every layer of adjacent helical coil is connected in series successively, layer is connected by via hole with helical coil on the layer, and two terminations of first and last are as output, the formation secondary coil; Around the nested making of each a secondary helical coil helical coil identical with its shape, every layer of adjacent helical coil is connected in series the formation primary winding successively, the layer with layer between a helical coil be connected by via hole, two terminations of first and last are as tested current input terminal.
5, PCB type hollow coil current-sensing device according to claim 4, it is characterized in that: a described helical coil, secondary helical coil are size evenly by in the rectangle, circle, 1/4 circle and the triangle that increase any, and the secondary helical coil is coaxial accordingly between layer and the layer.
6, PCB type hollow coil current-sensing device according to claim 4 is characterized in that: described primary winding directly is printed on the PCB around each secondary helical coil.
7, PCB type hollow coil current-sensing device according to claim 4 is characterized in that: last corresponding helical coil of all layers of PCB and secondary helical coil are coaxial.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620052659 CN200983314Y (en) | 2006-10-29 | 2006-10-29 | PCB hollow coil current sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620052659 CN200983314Y (en) | 2006-10-29 | 2006-10-29 | PCB hollow coil current sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200983314Y true CN200983314Y (en) | 2007-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620052659 Expired - Fee Related CN200983314Y (en) | 2006-10-29 | 2006-10-29 | PCB hollow coil current sensor |
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| CN (1) | CN200983314Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967267B (en) * | 2006-10-29 | 2012-06-27 | 长沙同庆电气信息有限公司 | PCB hollow coil current-sensing device |
| CN105390261A (en) * | 2015-10-19 | 2016-03-09 | 长沙润智电源有限公司 | Anti-jamming current transformer |
| CN111837043A (en) * | 2018-01-31 | 2020-10-27 | Nl咨询公司 | Sensor for sensing instantaneous rate of change of current using galvanic isolation and integration on printed circuit board |
| US11621124B2 (en) | 2017-12-07 | 2023-04-04 | Koninklijke Philips N.V. | Air-core inductor assembly |
-
2006
- 2006-10-29 CN CN 200620052659 patent/CN200983314Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1967267B (en) * | 2006-10-29 | 2012-06-27 | 长沙同庆电气信息有限公司 | PCB hollow coil current-sensing device |
| CN105390261A (en) * | 2015-10-19 | 2016-03-09 | 长沙润智电源有限公司 | Anti-jamming current transformer |
| US11621124B2 (en) | 2017-12-07 | 2023-04-04 | Koninklijke Philips N.V. | Air-core inductor assembly |
| CN111837043A (en) * | 2018-01-31 | 2020-10-27 | Nl咨询公司 | Sensor for sensing instantaneous rate of change of current using galvanic isolation and integration on printed circuit board |
| CN111837043B (en) * | 2018-01-31 | 2023-11-17 | Nl咨询公司 | Sensor for sensing instantaneous rate of change of current using electrical isolation and integration on printed circuit board |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Hunan Xiang Neng Electric Co., Ltd. Assignor: Changsha Tongqing Electric Co., Ltd. Contract fulfillment period: 2008.3.6 to 2016.10.28 Contract record no.: 2009430000002 Denomination of utility model: PCB hollow coil current-sensing device Granted publication date: 20071128 License type: Exclusive license Record date: 20090311 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2008.3.6 TO 2016.10.28; CHANGE OF CONTRACT Name of requester: HUNAN XIANGNENG ELECTRIC APPLICANCE CO., LTD. Effective date: 20090311 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071128 Termination date: 20121029 |