Current Divider for Magnetic Field Interference
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Solution Overview
Problem
Electronic electric meters face inaccuracies in measuring low current signals and false electrical consumption due to alternating magnetic field interferences, which affect the accuracy of measurements and cause incorrect pulse readings.
Innovation Solution
The electronic electric meter incorporates a current divider with a sampling resistor sheet made of high resistivity material, featuring through holes and signal lines that connect to both sides of the divider, allowing the signal lines to form circuits with opposite current directions, thereby counteracting induced currents generated by both definite and indefinite magnetic fields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a manganin current divider with planar structure is used, then the current sampling function is achieved, but alternating magnetic field interference generates induced currents that cause measurement errors
Solution Approach 1:
The current divider is segmented into multiple layers (first current divider layer and second current divider layer) with different structural configurations. Each layer has connecting ends positioned at different locations, creating spatial separation that disrupts the formation of large induced current loops under alternating magnetic field interference, thereby reducing measurement errors while maintaining current sampling functionality
Solution Approach 2:
The invention transitions from a planar two-dimensional structure to a three-dimensional multi-layer structure. By stacking current divider layers at different heights and positioning connecting ends at different spatial locations, the design adds a vertical dimension that reduces the effective area exposed to magnetic field interference and minimizes induced currents
2Ease of manufacture
If signal lines are connected on the same side of the current divider, then the circuit connection is simple, but the induced currents under magnetic field interference are enhanced
Solution Approach 1:
The connecting ends of the current divider are asymmetrically positioned at different locations on different layers. The first connecting end is positioned at a first location on the first layer, while the second connecting end is positioned at a second location on the second layer. This asymmetric spatial arrangement disrupts the symmetry of induced current paths under alternating magnetic fields, reducing the magnitude of interference currents while maintaining manufacturable connection configurations
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively reduces magnetic field interferences, ensuring accurate current sampling and preventing false readings by counteracting induced currents, thus enhancing measurement accuracy and allowing for easy industrialization at a lower cost.
Implementation Method 1
according to the Faraday electromagnetic induction law, when the diverter is influenced by the external alternating magnetic field, an induction voltage and an electromotive force are generated on the sampling line extending near the other side of the manganin resistor, and are balanced with the induction voltage and the electromotive force generated on the manganin resistor
Data Source
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AI summary
Disclosed is an electronic electric meter resistant to alternating magnetic field interferences, which comprises a current divider, a relay, and a circuit board of the electronic electric meter. The current divider comprises a piece of a sampling resistor sheet made of a high resistivity material. One through hole is provided in the sampling resistor sheet, the two ends of which are provided a first connecting end and a second connecting end, respectively. The first connecting end is formed by integrally protruding upwards from an upper-side edge of the current divider. The second connecting end is formed by integrally protruding downwards from a lower-side edge of the current divider. One signal line is connected on the first connecting end and the second connecting end, respectively. The signal line on the second connecting end passes through the through hole is hinged to the signal line on the first connecting end. The ends of the two signal lines are connected to the circuit board, respectively. The structure is adopted to counteract alternating magnetic field interferences in a definite direction (interferences generated by a cable), so as to further counteract alternating magnetic field interferences in indefinite directions, so as to effectively ensure the accuracy of measurement by the electronic electric meter.