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Lead structure of manganese-copper shunt, PCB, and layout structure of PCB

A manganin shunt, PCB board technology, applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve the problems of excessive electromagnetic induction current, inaccurate measurement, and meter operation error, so as to increase the loop area, The effect of solving electromagnetic induction mutual interference and preventing sampling interference

Active Publication Date: 2017-10-20
HEXING ELECTRICAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some existing criminals use the defect that the existing manganin-copper sampling electric energy meter is easily affected by the external alternating magnetic field and cannot be measured accurately to steal electricity. The strength varies, and the maximum error can reach 100%
In addition, the internal alternating electromagnetic interference in the design of the manganese-copper shunt cannot be ignored. For example, the magnetic flux leakage of the power frequency transformer affects the operation error of the meter; The magnetic induction current is too large, and the small signal is seriously affected, etc.

Method used

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  • Lead structure of manganese-copper shunt, PCB, and layout structure of PCB
  • Lead structure of manganese-copper shunt, PCB, and layout structure of PCB
  • Lead structure of manganese-copper shunt, PCB, and layout structure of PCB

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Experimental program
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Effect test

Embodiment 1

[0039] see figure 1, the design provided in this embodiment adopts the routing structure of the PCB board to resist the interference of the external alternating magnetic field on the manganin shunt, which mainly includes the manganin shunt 03, the first PCB board 01 and the second PCB board 02. The manganin shunt 03 is welded vertically on the first PCB board 01, the second PCB board 02 is parallel to the manganin shunt 03, and the PCB trace goes from the first current sampling point A of the manganin shunt 03 to the second PCB Draw a circular trace 04 on the board 02, and then walk back to point C on the first PCB board 01, and at the same time connect with the PCB trace drawn from the second sampling terminal B of the manganin shunt 03 in parallel or twisted pair To the AD sampling of the chip.

[0040] When there is no second PCB board 02, the alternating magnetic field only acts on the manganin shunt 03, and the induced electromotive force is accumulated on point B, and A...

Embodiment 2

[0043] see figure 2 and image 3 , the design provided in this embodiment adopts the wiring structure of the PCB board to resist the interference of the external alternating magnetic field on the manganin shunt, which mainly includes a sub-PCB board 10 and a manganin shunt 11 . The manganese copper shunt 11 is welded on the PCB board 10 parallel to the PCB board 10, and the PCB trace goes from the first current sampling point A of the manganese copper shunt 11 to the PCB board 10 to draw a circular trace 12, and then walks Go back to point C on the PCB board 10, and at the same time, connect the PCB trace with the second sampling terminal B of the manganin shunt 11 to the AD sampling of the chip in parallel or twisted pair.

[0044] In the same way, this lead structure also accumulates the electromotive force generated by the induced manganin loop at the second current sampling end of the original manganin shunt to the first current sampling end, and the two are accumulated ...

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Abstract

The invention discloses a lead structure of a manganese-copper shunt, a PCB, and a layout structure of the PCB. The first current sampling end and the second current sampling end of the manganese-copper shunt are located on the same side of the manganese-copper shunt. The second current sampling end is interfered with by an external alternating magnetic field. A first sampling signal line forms a circular line on the PCB arranged in parallel with the manganese-copper shunt and is connected with the AD sampling end of a chip with a second sample signal line in a parallel or twisted manner in order to introduce external alternating magnetic field interference into the first current sampling end such that the first current sampling end is subjected to external alternating magnetic field interference of the same magnitude as that of the external alternating magnetic field interference of the second current sampling end. By changing the layout way of the current sampling end of the manganese-copper shunt on the PCB, the interference of the alternating magnetic field on the second current sampling end is introduced into the first current sampling end so that the interference on the first and second current sampling ends are canceled out so that the sampling interference of the alternating magnetic field on the manganese-copper shunt is prevented.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a lead structure of a manganin shunt, a PCB board and a wiring structure of the PCB board. Background technique [0002] Manganin shunts are widely used in the field of instrument measurement current, and can be used for sampling detection of backflow, current limiting, and current sharing in communication systems, electronic complete machines, and automatic control power supplies. The manganin shunt has the characteristics of good stability and small temperature change. This device has been used as a current sampling device for electronic energy meters for decades, and it is still used as an indispensable sampling device today. [0003] The existing manganese-copper shunt is usually fixed on the incoming line end of the electronic equipment by fixing the copper sheet. The current sampling end of the manganese-copper shunt is connected with the electronic circuit PCB...

Claims

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Application Information

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IPC IPC(8): G01R15/00
CPCG01R15/00
Inventor 熊震
Owner HEXING ELECTRICAL
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