Crosstalk Compensation for Closely Packed Current Sensors
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Solution Overview
Problem
Closely packed current sensors experience significant crosstalk due to magnetic fields from neighboring conductors, leading to false readings, which is exacerbated in smaller, lower-cost electronic products.
Innovation Solution
A measurement module receives crosstalk compensation factors from a central controller, including distance and phase difference factors, to compute and transmit a reported current that minimizes crosstalk effects by combining its own measurements with those from neighboring modules, using a broadcast bus and data bus communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If current sensors are placed close together to monitor source currents on densely packed conductors, then measurement coverage and system integration are improved, but crosstalk between sensors increases causing false readings
Solution Approach 1:
The patent implements a feedback mechanism where current measurement values from all measurement modules are continuously monitored and fed back to calculating modules. These feedback signals are used to compute compensation values that account for crosstalk effects, which are then applied to correct the original measurements. This closed-loop feedback system dynamically adjusts for interference based on actual operating conditions.
Solution Approach 2:
The patent introduces calculating modules as intermediary components that receive raw current measurements from measurement modules and process them through compensation algorithms. These calculating modules act as mediators between the physical sensors and the final measurement outputs, applying mathematical corrections based on crosstalk compensation factors to eliminate false readings caused by magnetic field interference.
Solution Approach 3:
The patent changes the measurement parameters by introducing crosstalk compensation factors that are calculated based on distance relationships and phase differences between adjacent current sensors. These compensation factors modify the raw measurement data by accounting for the magnitude of source currents and spatial relationships, effectively transforming the measurement parameters to eliminate crosstalk effects.
2Volume of moving object
If smaller, lower cost sensors are used in smaller sized electronic products, then device size and cost are reduced, but crosstalk susceptibility increases
Solution Approach 1:
The feedback mechanism continuously monitors current measurements from all modules and dynamically computes compensation values based on actual operating conditions. This allows the system to adapt to varying crosstalk levels that occur with different current magnitudes and operational states, maintaining measurement accuracy despite the use of smaller, more susceptible sensors in compact products.
Solution Approach 2:
The system applies parameter changes through crosstalk compensation factors that are specifically calculated for each sensor's spatial position and phase relationship with neighboring sensors. These dynamic parameter adjustments compensate for the increased susceptibility of smaller sensors by mathematically eliminating the proportionality between measured values and crosstalk interference.
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 solution effectively mitigates crosstalk between current sensors, providing accurate current measurements by accounting for spatial and phase differences, thereby improving measurement reliability in densely packed systems.
Implementation Method 1
The source current in a primary conductor being measured by one current sensor creates a magnetic field that may inadvertently link with a neighboring current sensor
Implementation Method 2
The source current in a primary conductor being measured by one current sensor creates a magnetic field that may inadvertently link with a neighboring current sensor on a neighboring primary conductor, causing false readings or crosstalk
Data Source
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AI summary
A measurement module receives crosstalk compensation factors that include distance factors based on respective distances of a current sensor of the module from respective current sensors of other measurement modules and phase difference factors based on respective differences between the phase of a source current measured by the module and respective phases of source currents measured by the other modules. The module monitors messages reporting current measurements transmitted from the other modules connected to a broadcast bus, of current measurements made by respective current sensors of the other modules measuring other respective source currents. The module determines a reported current that is computed as a function of current measurement by the module's current sensor, reported current measurements monitored from the other modules, and the received crosstalk compensation factors. The module transmits the determined reported current over the broadcast bus to the other modules and a central controller.