Conductor Structure Layout for Low Cross-Talk Current Sensing
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Solution Overview
Problem
Existing current sensor systems in electric vehicles face challenges in accurately measuring high currents due to conductor cross-talk errors, which are exacerbated by the proximity of multiple conductor structures and the sensitivity to misplacement and environmental magnetic fields.
Innovation Solution
The system employs a conductor structure with notches and holes designed to accommodate a current sensor device, utilizing magnetic field sensing elements that are differentially coupled to minimize the impact of neighboring conductor currents and environmental interference, allowing for precise current measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple conductor structures are placed in proximity to each other, then space utilization is improved, but conductor cross-talk error increases
Solution Approach 1:
The conductor structure is segmented into multiple isolated conductive paths (first conductor path, second conductor path, third conductor path) within a single structural unit. Each path can carry current independently while maintaining close proximity, enabling high space utilization while preventing cross-talk through proper geometric isolation and positioning of sensor elements relative to each path.
Solution Approach 2:
Different regions of the conductor structure are designed with locally optimized properties - the first, second, and third conductor paths are positioned at specific locations with distinct geometric characteristics. The sensor device elements are strategically placed to sense current in specific paths while being minimally affected by currents in other paths, achieving accurate measurement despite close spacing.
2Measurement precision
If current sensor device is placed close to conductor structure, then measurement sensitivity is improved, but sensitivity to misplacement and environmental interference increases
Solution Approach 1:
The sensor device combines multiple magnetic field sensing elements (first and second sensor elements) within a single integrated unit that can be positioned relative to the conductor structure. This merged configuration allows differential sensing where the combined signal from multiple elements provides accurate current measurement while common-mode environmental interference and placement variations tend to cancel out, reducing sensitivity to harmful factors.
Solution Approach 2:
The conductor structure itself serves as an intermediary element with specifically designed geometric features (notches, holes, and conductor paths) that mediate between the sensor device and the current being measured. The structured geometry creates controlled magnetic field distribution that enhances measurement accuracy while providing geometric reference features that reduce sensitivity to misplacement.
3Measurement precision
If magnetic shields are added to reduce cross-talk error, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The conductor structure performs self-service by incorporating the cross-talk reduction functionality directly into its own geometry. The first, second, and third conductor paths are positioned and dimensioned such that the structure itself creates magnetic field distribution patterns that minimize cross-talk between paths. The sensor device leverages this self-organizing geometric property without requiring external magnetic shielding components.
Solution Approach 2:
The invention extracts the cross-talk reduction function from separate magnetic shield components and integrates it directly into the conductor structure's geometry. By removing the need for additional shielding elements and embedding the cross-talk mitigation capability within the conductor paths and structural notches, the solution achieves measurement accuracy while reducing device complexity and cost.
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 configuration enables accurate current measurement with high signal-to-noise ratio and reduced sensitivity to misplacement, achieving measurement accuracy within 1% even with high currents, eliminating the need for bulky and expensive magnetic shields.
Implementation Method 1
a current sensor device positioned in the hole, the sensor device comprising first and second magnetic field sensing elements configured to be sensitive to a magnetic field along the second dimension when current flows through the conductor structure
Data Source
AI summary
Disclosed are example systems, methods, and structures for reducing conductor cross-talk error. In particular, disclosed is an example conductor structure that can conduct current and that accommodates placement of a current sensor device. The systems, methods, and structures disclosed herein may allow for multiple example conductor structures to be placed in proximity to each other, and may allow a current sensor device to measure an amount of current flowing in one of the conductor structures, while reducing the impact of any current flowing in a neighboring conductor structure on the measurement of the current sensor device. Also disclosed herein are example methods for making such a conductor structure. Further disclosed herein are example systems that incorporate both such an example conductor structure and a current sensor device, and example methods for configuring a current sensor system including both such an example conductor structure and current sensor device.