The lead structure of the manganese copper shunt, the PCB board and the wiring structure of the PCB board

Abstract

The invention discloses a lead wire structure of a manganese-copper current divider, a PCB and a wiring structure of the PCB. A first current sampling end and a second current sampling end of the manganese-copper current divider are arranged at the same side of the manganese-copper current divider. The second current sampling end is interfered by an external alternate magnetic field. A second sampling signal wire forms an annular wiring on the PCB which is arranged in parallel with the manganese-copper current divider. Furthermore the second sampling signal wire and the first sampling signal wire are connected with an AD sampling end of a chip in a parallel manner or twisted-pair manner, thereby simultaneously applying the external alternate magnetic field interference to manganese-copper and the annular wiring so that the external alternate magnetic field interferences which are bear by the second current sampling end are offset to each other. According to the lead wire structure, a wiring manner that the current sampling end of the manganese-copper current divider is arranged on the PCB is utilized, and the interferences of the alternate magnetic field to the second current sampling end are offset to each other, thereby preventing the sampling interference of the alternate magnetic field to the manganese-copper current divider.

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...

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.

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