CN107345977B - Lead structure of manganin shunt, PCB and wiring structure of PCB - Google Patents
Lead structure of manganin shunt, PCB and wiring structure of PCB Download PDFInfo
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- CN107345977B CN107345977B CN201710533143.2A CN201710533143A CN107345977B CN 107345977 B CN107345977 B CN 107345977B CN 201710533143 A CN201710533143 A CN 201710533143A CN 107345977 B CN107345977 B CN 107345977B
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a lead structure of a manganin shunt, a PCB (printed Circuit Board) and a wiring structure of the PCB, wherein a first current sampling end and a second current sampling end of the manganin shunt are positioned at the same side of the manganin shunt, and the second current sampling end is interfered by an external alternating magnetic field; the second sampling signal line forms an annular wiring on a PCB which is arranged in parallel with the manganin shunt, and is connected with the first sampling signal line in a parallel or twisted-pair mode to be connected with the AD sampling of the chip, so that the external alternating magnetic field interference acts on the manganin and the annular wiring at the same time, and the external alternating magnetic field interference borne by the second current sampling end is mutually counteracted. The invention adopts the wiring mode of changing the current sampling end of the manganin shunt on the PCB board to offset the interference of the alternating magnetic field to the second current sampling end, thereby preventing the sampling interference of the alternating magnetic field to the manganin shunt.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to a lead structure of a manganin shunt, a PCB and a routing structure of the PCB.
Background
The manganin shunt is widely applied to the field of instrument current measurement, and can be used for sampling and detecting the backflow, current limiting and current sharing of a communication system, an electronic complete machine, an automatic control power supply and the like. The manganin shunt has the characteristics of good stability and small temperature variation. The device has been used as a current sampling device of an electronic electric energy meter for decades, and is still used as an indispensable sampling device until now.
The existing manganin shunt is usually fixed at the wire inlet end of electronic equipment through a fixed red copper sheet, the current sampling end of the manganin shunt is connected with an electronic circuit PCB board through two current sampling signal wires, and the sampling signal wires adopt a vertical wiring mode or are directly welded on the PCB board. Because the current signal that the manganin shunt gathered is very little, generally microvolt level, so traditional this kind of wiring mode of directly installing on the terminal or series connection on the relay is particularly easily disturbed by alternating magnetic field to lead to current sampling and measurement inaccurate.
According to Faraday's law of electromagnetic induction, the formula for calculating the induced electromotive force generated by the coil is as follows: when an alternating magnetic field interferes, a closed loop is arranged in a gap between the manganin and the manganin or a gap between the manganin and the cable or a gap between the PCB and the manganin, corresponding induced electromotive force can be generated at a sampling end, and the induced electromotive force seriously influences the accuracy of current sampling after subsequent circuit amplification and AD conversion. The existing lawless persons steal electricity by utilizing the defect that the existing electric energy meter based on manganin sampling is easily influenced by an external alternating magnetic field and cannot be accurately metered, and the error caused by stealing electricity by utilizing the means is changed along with the strength of the alternating magnetic field, so that the maximum error can reach 100 percent. In addition, alternating electromagnetic interference inside the manganin shunt in the design is not ignored, for example, the leakage flux of the power frequency transformer affects the running error of the meter; the three-phase meter three-manganese copper symmetrical connection method has the defects that the electromagnetic induction current between phases is overlarge, the influence of small signals is serious, and the like.
Therefore, how to resist the interference of an external alternating magnetic field on the manganin shunt is a problem to be solved.
Disclosure of Invention
The invention aims to provide a lead structure of a manganin shunt, which is resistant to external alternating magnetic field interference, a PCB and a wiring structure of the PCB, and is mainly used for a manganin current sampling device which is resistant to external alternating magnetic field interference in the field of electric energy meters.
The manganin shunt comprises a first current sampling end and a second current sampling end, and is characterized in that the first current sampling end is connected with a first sampling signal wire, and the second current sampling end is connected with a second sampling signal wire;
the first current sampling end and the second current sampling end are positioned on the same side of the manganin shunt; the second current sampling end is interfered by an external alternating magnetic field;
the second sampling signal line forms an annular wiring on a PCB which is arranged in parallel with the manganin shunt, and is connected with the first sampling signal line in a parallel or twisted-pair mode to be connected with the AD sampling of the chip, so that the external alternating magnetic field interference acts on the manganin and the annular wiring at the same time, and the external alternating magnetic field interference on the second current sampling end is mutually counteracted.
The invention also provides a lead structure of the manganin shunt, which comprises a first PCB, a second PCB and the manganin shunt vertically welded on the first PCB;
the manganin current divider comprises a first current sampling end and a second current sampling end; the second current sampling end is interfered by an external alternating magnetic field;
the first current sampling end is connected with a first sampling signal wire, the second current sampling end is connected with a second sampling signal wire, and the first current sampling end and the second current sampling end are positioned on the same side of the manganin current divider;
the second PCB is arranged on one side of the manganin shunt in parallel;
the first sampling signal line is led to the second PCB from the first current sampling end to form a ring-shaped lead, and then returns to the first PCB, and finally is connected to the AD sampling of the chip together with the second sampling signal line in a parallel or twisted-pair mode.
The invention also provides a lead structure of the manganin shunt, which comprises a third PCB and the manganin shunt welded on the third PCB in parallel;
the manganin current divider comprises a first current sampling end and a second current sampling end; the second current sampling end is interfered by an external alternating magnetic field;
the first current sampling end is connected with a first sampling signal wire, the second current sampling end is connected with a second sampling signal wire, and the first current sampling end and the second current sampling end are positioned on the same side of the manganin current divider;
and the second sampling signal wire is led to the third PCB from the second current sampling end to form a ring-shaped lead, and then is connected to the AD sampling of the chip together with the first sampling signal wire in a parallel or twisted pair mode.
The invention provides a PCB (printed circuit board), which comprises a substrate, wherein a lead structure of the manganin shunt is arranged on the substrate.
The invention provides an electric energy meter which comprises a manganin shunt, wherein the manganin shunt adopts a lead structure of any one of the manganin shunts.
The invention provides a routing structure of a PCB (printed circuit board), which comprises a first PCB, a second PCB and a manganin shunt vertically welded on the first PCB;
the manganin current divider comprises a first current sampling end and a second current sampling end; the second current sampling end is interfered by an external alternating magnetic field;
the first current sampling end is connected with a first sampling signal wire, the second current sampling end is connected with a second sampling signal wire, and the first current sampling end and the second current sampling end are positioned on the same side of the manganin current divider;
the second PCB is positioned on one side of the manganin shunt and is arranged in parallel with the manganin shunt;
and the second sampling signal wire is led to the second PCB from the second current sampling end to form a ring-shaped lead, and then returns to the first PCB, and finally is connected to the AD sampling of the chip together with the first sampling signal wire in a parallel or twisted-pair mode.
The invention provides a routing structure of a PCB (printed circuit board), which is characterized by comprising the PCB and a manganin shunt welded on the PCB in parallel;
the manganin current divider comprises a first current sampling end and a second current sampling end; the second current sampling end is interfered by an external alternating magnetic field;
the first current sampling end is connected with a first sampling signal wire, the second current sampling end is connected with a second sampling signal wire, and the first current sampling end and the second current sampling end are positioned on the same side of the manganin current divider;
and the second sampling signal wire is led to the PCB from the second current sampling end to form a ring-shaped lead wire, and then is connected to the AD sampling of the chip together with the second sampling signal wire in a parallel or twisted pair mode.
Compared with the prior art, the technical scheme has the following advantages:
according to the lead structure of the manganin shunt, the PCB and the routing structure of the PCB, the routing mode of the current sampling end of the manganin shunt on the PCB is changed, and the loop area is increased, so that interference of an alternating magnetic field on manganin from the second current sampling end is superposed with interference of annular routing of a second sampling signal line, the interference of the alternating magnetic field and the second current sampling end is mutually counteracted, and the sampling interference of the alternating magnetic field on the manganin shunt is prevented. The interference of an external alternating magnetic field can be solved, and the mutual interference of the leakage flux of an internal power frequency transformer and the electromagnetic induction between the phases of the three-phase meter three-manganese-copper symmetrical scheme can be solved.
Drawings
Fig. 1 is a schematic view of a routing structure of a PCB according to an embodiment of the present invention;
fig. 2 is a side view of a routing structure of a PCB board according to a second embodiment of the present invention;
fig. 3 is a top view of a routing structure of a PCB according to a second embodiment of the present invention.
Detailed Description
The above and further features and advantages of the present invention will be apparent from the following, complete description of the invention, taken in conjunction with the accompanying drawings, wherein the described embodiments are merely some, but not all embodiments of the invention.
The lead structure of the manganin shunt provided by the invention prevents sampling interference of an alternating magnetic field to the manganin shunt by changing the traditional lead structure, and is mainly used for a manganin current sampling device which is resistant to external alternating magnetic field interference in the field of electric energy meters.
The manganin shunt is provided with three ends, namely a voltage sampling end, a first current sampling end and a second current sampling end, wherein the first current sampling end is connected with a first sampling signal line, and the second current sampling end is connected with a second sampling signal line. According to the lead structure of the manganin shunt, the first current sampling end and the second current sampling end are positioned on the same side of the manganin shunt; the second current sampling end is interfered by an external alternating magnetic field; and the second sampling signal line forms a circular wiring on the PCB which is arranged in parallel with the manganin shunt, and is connected with the first sampling signal line in a parallel or twisted-pair mode to be connected with the AD sampling of the chip together, so that external alternating magnetic field interference is introduced into the circular wiring, and the external alternating magnetic field interference borne by the second current sampling end is mutually counteracted.
The method adopts a wiring mode of changing the current sampling end of the manganin shunt on the PCB board, increases the area of a loop, and therefore interferes an alternating magnetic field with the manganin of the second current sampling end, and simultaneously introduces an annular wiring, so that the interference of the external alternating magnetic field received by the second current sampling end is mutually offset, and the sampling interference of the alternating magnetic field to the manganin shunt is prevented. The interference of an external alternating magnetic field can be solved, and the mutual interference of the leakage flux of an internal power frequency transformer and the electromagnetic induction between the phases of the three-phase meter three-manganese-copper symmetrical scheme can be solved.
According to the invention, by increasing the loop area of the lead, the interference of the alternating magnetic field on the second current sampling end is introduced, so that the alternating magnetic field is interfered by the original alternating magnetic field with the same size and opposite direction introduced by the manganin, and the alternating magnetic field are mutually offset, thereby preventing the sampling interference of the alternating magnetic field on the manganin shunt. The implementation mode of the method can be various, for example, the manganin shunt can be vertically welded on a first PCB, then a second PCB is arranged in parallel on one side of the manganin shunt, a second sampling signal line is led onto the second PCB from a second current sampling end to form a circular line, then the circular line returns to the first PCB, and finally the circular line and the first sampling signal line are connected to the AD sampling of the chip in a parallel or twisted-pair mode. The manganin shunt can be parallelly welded on a PCB, a second sampling signal wire is led to the PCB from a second current sampling end to form an annular wiring, and then the annular wiring and the first sampling signal wire are connected to the AD sampling of the chip in a parallel or twisted-pair mode.
The embodiment of the invention also provides a PCB which comprises a substrate, wherein the lead structure of the manganin shunt is arranged on the substrate.
The following describes the implementation of the present invention in detail by referring to two specific embodiments.
Example one
Referring to fig. 1, the design of the trace structure using the PCB for resisting the interference of the external alternating magnetic field to the manganin shunt provided by this embodiment mainly includes the manganin shunt 03, the first PCB 01 and the second PCB 02. The manganin shunt 03 is vertically welded on the first PCB board 01, the second PCB board 02 is close to the manganin shunt 03 in parallel, the PCB wiring is led from a second current sampling point B of the manganin shunt 03 to the second PCB board 02 to draw an annular wiring 04, then the PCB wiring returns to a point C on the first PCB board 01, and meanwhile, the PCB wiring led out from the first sampling end A of the manganin shunt 03 is connected to the AD sampling of the chip in a parallel or twisted-pair mode.
Originally, when there is not the second PCB 02, the alternating magnetic field only acts on the manganin shunt 03, the induced electromotive force is accumulated on the point B, A, B two points enter the AD sampling of the chip, △ UAB ═ I × R + E, after adding the second PCB 02, the induced electromotive force is respectively acted on A, C two points, △ UAC ═ △ UAB + △ UBC ═ I × R + E '≈ I × R, the magnitude of the current is close to the actual magnitude of the current, A, C two points enter the AD sampling of the chip, wherein I is the current to be sampled, R is the manganin value, E is the induced electromotive force of the power frequency magnetic field acting on the manganin shunt 03, E' is the induced electromotive force of the alternating magnetic field acting on the second PCB 02, the magnitude of the electromotive force is the same as E, and the directions are opposite.
The lead has a simple structure, the second current sampling end of the original manganin shunt receives the electromotive force generated by the manganin loop and the induced electromotive force generated by the current loop, the two are equal in size and opposite in direction, so that the two are mutually offset, the AD sampling value is closer to the actual current value, and the sampling interference of an alternating magnetic field on the manganin shunt can be prevented.
Example two
Referring to fig. 2 and 3, the design of the trace structure using the PCB for resisting the interference of the external alternating magnetic field to the manganin shunt provided by this embodiment mainly includes a sub PCB 10 and a manganin shunt 11. The manganin shunt 11 is parallel to the PCB 10 and welded on the PCB 10, the PCB wire is led from a second current sampling point B of the manganin shunt 11 to the PCB 10 to draw an annular wire 12, then the PCB wire is led back to a point C on the PCB 10, and meanwhile, the PCB wire led out from the first sampling end A of the manganin shunt 11 is connected to the AD sampling of the chip in a parallel or twisted-pair mode.
In a similar way, the lead structure receives the electromotive force generated by the manganin loop and the induced electromotive force generated by the current loop at the second current sampling end of the original manganin shunt, the two are equal in size and opposite in direction, so that the two are mutually offset, the AD sampling value is closer to the actual current value, and the sampling interference of the alternating magnetic field on the manganin shunt can be prevented.
Based on the embodiment, the embodiment of the invention also provides an electric energy meter, which comprises the manganin shunt, wherein the manganin shunt adopts the lead structure of the manganin shunt, so that the sampling interference of an alternating magnetic field on the manganin shunt can be effectively prevented, the influence of the electromagnetic induction mutual interference between phases in a three-manganin symmetric scheme of a three-phase meter is solved, and the influence of the leakage flux of a power frequency transformer on the metering of the electric energy meter when the distance between the power frequency transformer and the manganin shunt is short is solved.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (7)
1. The lead structure of the manganin shunt comprises a first current sampling end and a second current sampling end, and is characterized in that the first current sampling end is connected with a first sampling signal line, and the second current sampling end is connected with a second sampling signal line;
the first current sampling end and the second current sampling end are positioned on the same side of the manganin shunt; the second current sampling end is interfered by an external alternating magnetic field;
the second sampling signal line forms an annular wiring on a PCB which is arranged in parallel with the manganin shunt, and is connected with the first sampling signal line in a parallel or twisted-pair mode to be connected with the AD sampling of the chip, so that the external alternating magnetic field interference acts on the manganin and the annular wiring at the same time, and the external alternating magnetic field interference on the second current sampling end is mutually counteracted.
2. The lead structure of the manganin shunt is characterized by comprising a first PCB, a second PCB and the manganin shunt vertically welded on the first PCB;
the manganin current divider comprises a first current sampling end and a second current sampling end; the second current sampling end is interfered by an external alternating magnetic field;
the first current sampling end is connected with a first sampling signal wire, the second current sampling end is connected with a second sampling signal wire, and the first current sampling end and the second current sampling end are positioned on the same side of the manganin current divider;
the second PCB is arranged on one side of the manganin shunt in parallel;
the first sampling signal line is led to the second PCB from the first current sampling end to form a ring-shaped lead, and then returns to the first PCB, and finally is connected to the AD sampling of the chip together with the second sampling signal line in a parallel or twisted-pair mode.
3. The lead structure of the manganin shunt is characterized by comprising a third PCB and the manganin shunt welded on the third PCB in parallel;
the manganin current divider comprises a first current sampling end and a second current sampling end; the second current sampling end is interfered by an external alternating magnetic field;
the first current sampling end is connected with a first sampling signal wire, the second current sampling end is connected with a second sampling signal wire, and the first current sampling end and the second current sampling end are positioned on the same side of the manganin current divider;
and the second sampling signal wire is led to the third PCB from the second current sampling end to form a ring-shaped lead, and then is connected to the AD sampling of the chip together with the first sampling signal wire in a parallel or twisted pair mode.
4. A PCB board comprising a substrate, wherein a lead structure of the manganin shunt of any one of claims 1 to 3 is disposed on the substrate.
5. An electric energy meter comprising a manganin shunt, characterized in that the manganin shunt adopts the lead structure of the manganin shunt according to any one of the claims 1 to 3.
6. A routing structure of a PCB is characterized by comprising a first PCB, a second PCB and a manganin shunt vertically welded on the first PCB;
the manganin current divider comprises a first current sampling end and a second current sampling end; the second current sampling end is interfered by an external alternating magnetic field;
the first current sampling end is connected with a first sampling signal wire, the second current sampling end is connected with a second sampling signal wire, and the first current sampling end and the second current sampling end are positioned on the same side of the manganin current divider;
the second PCB is positioned on one side of the manganin shunt and is arranged in parallel with the manganin shunt;
and the second sampling signal wire is led to the second PCB from the second current sampling end to form a ring-shaped lead, and then returns to the first PCB, and finally is connected to the AD sampling of the chip together with the first sampling signal wire in a parallel or twisted-pair mode.
7. A routing structure of a PCB is characterized by comprising the PCB and a manganin shunt welded on the PCB in parallel;
the manganin current divider comprises a first current sampling end and a second current sampling end; the second current sampling end is interfered by an external alternating magnetic field;
the first current sampling end is connected with a first sampling signal wire, the second current sampling end is connected with a second sampling signal wire, and the first current sampling end and the second current sampling end are positioned on the same side of the manganin current divider;
and the second sampling signal wire is led onto the PCB from the second current sampling end to form a ring-shaped lead wire, and then is connected with the first sampling signal wire in a parallel or twisted pair mode to perform AD sampling of a chip.
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| CN201710533143.2A CN107345977B (en) | 2017-07-03 | 2017-07-03 | Lead structure of manganin shunt, PCB and wiring structure of PCB |
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| CN201710533143.2A CN107345977B (en) | 2017-07-03 | 2017-07-03 | Lead structure of manganin shunt, PCB and wiring structure of PCB |
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| CN107345977B true CN107345977B (en) | 2020-01-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108845179A (en) * | 2018-06-07 | 2018-11-20 | 宁波三星智能电气有限公司 | electric energy meter current sampling module |
| CN109324307B (en) * | 2018-09-02 | 2022-02-08 | 青岛鼎信通讯科技有限公司 | Electric energy meter power frequency interference cancellation method based on PCB |
| CN111190036A (en) * | 2020-02-28 | 2020-05-22 | 桐乡市伟达电子有限公司 | Shunt lead structure, electric power meter with shunt lead structure and manufacturing method of shunt lead structure |
| CN113358904A (en) * | 2021-04-30 | 2021-09-07 | 南方电网数字电网研究院有限公司 | Anti-interference device for electric energy meter and wiring method thereof |
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Effective date of registration: 20210303 Address after: No. 1418, Moganshan Road, Gongshu District, Hangzhou, Zhejiang 310000 (Shangcheng Industrial Park) Patentee after: HANGZHOU HEXING ELECTRICAL Co.,Ltd. Patentee after: NINGBO HENGLIDA TECHNOLOGY Co.,Ltd. Address before: 1418 Moganshan Road, Hangzhou, Zhejiang 310000 (Shangcheng Industrial Park) Patentee before: HANGZHOU HEXING ELECTRICAL Co.,Ltd. Patentee before: NINGBO HENGLIDA TECHNOLOGY Co.,Ltd. Patentee before: HUNAN HAIXING ELECTRICAL APPLIANCE Co.,Ltd. |