Coreless Current Sensor Auto-Calibration for Position Independence
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current coreless current sensors are limited by their dependence on a non-varying position with respect to the current-carrying wire, which restricts their application and requires complex and expensive solutions to compensate for wire tilt.
Innovation Solution
A coreless current sensor system using two 2D linear magnetic field sensors with auto-calibration capabilities, allowing for independent calculation of current amplitude regardless of sensor position, enabling flexible installation without sacrificing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a coreless current sensor is placed in close proximity to a current-carrying wire to sense magnetic field, then measurement accuracy is improved, but the sensor becomes dependent on its position with respect to the wire which limits application flexibility
Solution Approach 1:
The patent divides the sensing function into multiple 2D-Hall sensors arranged in a circular pattern, where each sensor measures magnetic field components at different positions. This segmentation allows the system to reconstruct current information independent of the wire's position relative to the sensor array center.
Solution Approach 2:
The patent transitions from a single-point measurement approach to a distributed circular array of sensors, adding spatial dimensionality to the measurement system. This dimensional expansion enables position-independent current measurement by utilizing magnetic field variations across multiple locations.
2Measurement precision
If complex compensation solutions are implemented to account for wire tilt, then measurement accuracy is maintained, but device complexity and cost increase
Solution Approach 1:
The patent implements a dynamic measurement approach where the system automatically adapts to wire position and tilt variations through real-time calibration procedures. Instead of rigid mechanical compensation, the system dynamically adjusts measurement parameters and calculation algorithms based on actual sensor readings.
Solution Approach 2:
The patent incorporates calibration procedures that use feedback from the sensor measurements themselves to determine wire position and orientation. The system measures magnetic field components, processes this feedback information through calibration algorithms, and uses the results to compensate for position and tilt effects without requiring external position sensors or complex mechanical adjustments.
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
Enables accurate current measurement independent of sensor position, enhancing installation flexibility and reducing complexity and cost compared to existing solutions.
Implementation Method 1
magnetic field sensors that are disposed adjacent to the current-carrying wire that measure a generated magnetic field
Implementation Method 2
a sensor (e.g. a Hall sensor) is placed in close proximity to a current-carrying conductor to sense a magnetic field
Data Source
AI summary
The described techniques address issues associated with coreless current sensors by implementing a current sensor solution that may use as few as two, two-dimensional (2D) linear sensors. The discussed techniques provide a coreless current sensor solution that is independent of the sensor position with respect to a current-carrying conductor. An algorithm is also described for auto-calibration of sensor position with respect to a current-carrying conductor to calculate the current flowing through the conductor. The calculation of current may be performed independent of the position of the current-carrying conductor with respect to the sensor, and thus the disclosed techniques provide additional advantages regarding installation flexibility without sacrificing measurement accuracy.