An anti-interference shunt and its electronic watt-hour meter

Abstract

The invention discloses an antijamming shunt and an electronic electric meter thereof. The shunt comprises a section of sampling resistance sheet made of a high-resistance material; a first sampling pin and a second sampling pin are respectively arranged at two ends of the sampling resistance sheet; the first sampling pin is formed by upwards integrally extending the edge of the upper side of the shunt; the second sampling pin is formed by downwards integrally extending the edge of the downside of the shunt; a through hole is formed in the middle of the sampling resistance sheet and is positioned between the first sampling pin and the second sampling pin; the first sampling pin and the second sampling pin are both of L-shaped structures; each L-shaped structure is formed by a horizontal section and a vertical section; the tail end of the horizontal section of the first sampling pin extends along the horizontal direction to exceed the position of the central line of the through hole along the vertical direction. The structure of the shunt is improved, and the interference from an uncertain alternating magnetic field is fully eliminated, so the sampling is accurate, and the aim of enabling the sampling to be accurate and the metering precision of corresponding metering instruments not to be influenced by the magnetic field is achieved.

Description

technical field [0001] The invention relates to the technical field of electronic instruments, in particular to an anti-interference shunt and an electronic electric energy meter thereof. Background technique [0002] Shunts are widely used in electronic energy meters, and shunts are usually used for real-time sampling of user supply voltage and current. The shunts in the prior art are usually made of high stability materials such as manganese copper, figure 1 It is a schematic diagram of a three-dimensional structure of a flow divider in the prior art, figure 2 is the front view of the shunt of the prior art, image 3 It is a schematic diagram of a three-dimensional structure of a shunt connecting signal lines in the prior art; Figure 4 Front view of connecting signal wires for prior art shunts, Figure 5 Side view of connecting signal wires for prior art splitters. see Figure 1 to Figure 5 As shown, the shunt is a chip structure, and the shunt contains a sampling ...

AI Technical Summary

Problems solved by technology

With this kind of shunt in the prior art, after adopting this structure, the sampling resistor 100 will be divided into two regions by the signal line on the projection plane (that is, the plane perpendicular to the direction of the magnetic field), forming two regions with opposite current directions. circuit, such as Figure 4 In the loop S1 and loop S2, under the action of a certain alternating magnetic field (usually from the magnetic field interference generated by the cable), the induced currents generated on both sides are in opposite directions and can cancel each other out; then the lower signal line 105 can be used to pass through After the through hole 101 of the sampling resistor sheet, the sampling resistor sheet 100 and the lower signal line 105 form two loops with opposite current directions on the lateral projection surface of the sampling resistor sheet, such as Figure 5 In the loop S3 and the loop S4, under the action of an uncertain alternating magnetic field (the direction is not perpendicular to the sampling resistor), the induced currents generated on both sides are in opposite directions and can cancel each other out. This shunt in the prior art, Since the heat-shrinkable tube 106 does not have a fixed column, the signal line is prone to loosening, causing the areas of the loop S3 and the loop S4 to be unequal, that is, the induction areas in the upper and lower magnetic fields are unequal, and the resulting induced currents are also unequal and cannot be completely offset. As a result, it will still affect the sampling value and the measurement accuracy of the corresponding measuring instrument

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