Integrated Current Sensor Layout for Dual-Current Cross-Talk Reduction
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Solution Overview
Problem
Existing current sensor systems face challenges in measuring two independent currents with high accuracy, compactness, and robustness against external disturbances while minimizing cross-talk and requiring less processing power, particularly in industrial and automotive applications.
Innovation Solution
A current sensor device with integrated magnetic sensors and a processing circuit on a semiconductor substrate, configured to measure two independent currents using a plurality of magnetic sensors arranged in specific geometries and orientations, reducing cross-talk through passive means and requiring minimal parameters for calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic sensors are used to measure currents without physical contact, then measurement safety and voltage domain isolation are improved, but cross-talk between conductors and external disturbance fields increase
Solution Approach 1:
The sensor device is divided into separate sensing regions for each conductor, with magnetic sensors positioned at distinct locations. The processing circuit separately processes signals from each region, enabling independent current measurement while minimizing mutual interference through spatial segmentation of the sensing function.
Solution Approach 2:
The patent introduces a processing circuit as an intermediary that receives magnetic field signals from multiple sensors and calculates the individual current values through computational methods. This intermediary processing layer separates the raw sensor signals, allowing the system to distinguish between conductors and reject external disturbance fields through algorithmic processing rather than physical isolation alone.
2Measurement precision
If multiple magnetic sensors are used to measure two independent currents, then measurement accuracy is improved, but device complexity and processing requirements increase
Solution Approach 1:
The processing circuit is designed to perform multiple functions: it processes signals from multiple magnetic sensors, calculates individual current values for each conductor, and can detect external disturbance fields. This multi-functional approach consolidates what would otherwise require separate processing paths into a single integrated circuit, reducing overall device complexity while maintaining high measurement accuracy.
3Measurement precision
If magnetic sensors are positioned close to conductors for accurate measurement, then measurement sensitivity is improved, but sensitivity to external disturbance fields increases
Solution Approach 1:
The patent positions magnetic sensors at specific localized regions near each conductor where the magnetic field from that conductor is strongest. By optimizing the local positioning of sensors relative to their target conductors, the system maximizes measurement sensitivity for each conductor while the processing circuit compensates for external disturbance fields through signal separation and calculation methods.
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
The device achieves accurate, compact, and robust current measurement with reduced external interference, suitable for industrial and automotive environments, and requires less processing power.
Implementation Method 1
They offer the advantage of being able to measure a current without making physical contact, thus avoiding problems of different voltage domains, short-circuits, etc.
Implementation Method 2
a semiconductor substrate with a plurality of at least two (or at least three or at least four) magnetic sensors
Data Source
Figure 1A~1D
Figure 2A~2C
Figure 3A~3C
AI summary
An integrated current sensor device (1200) for measuring two independent currents (11, 12), comprising: a semiconductor substrate (1201) comprising a plurality of at least two magnetic sensors (H1, H2, H3, H4); a processing circuit (4113) connected to said magnetic sensors, and configured for determining a value (11) of a first current flowing through a first conductor portion (C1), and a value (12) of a second current flowing through a second conductor portion (C2), based on signals obtained from magnetic sensors, e.g. based on pairwise differences. The conductor portions may be internal or external, may be crossing or parallel, may have a zig-zag, may have a U-shape. The magnetic sensors may comprise two to four Hall elements, with or without integrated magnetic concentrators.