Magnetic Sensor Pairs for Contactless Current Measurement
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Solution Overview
Problem
Existing contactless current measurement devices using magnetic sensors face challenges in achieving accurate measurements, particularly when multiple wires are present, due to interference from nearby current-carrying wires and the need for precise wire placement, and they struggle to measure both AC and DC currents effectively in tight spaces.
Innovation Solution
The use of magnetic sensor pairs arranged within a housing to generate signals indicative of magnetic fields in multiple directions, combined with a hardware processor to derive current measurements, allowing for simultaneous measurement of multiple wires and reducing sensitivity to wire placement and interference, while enabling both AC and DC measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnetic sensor is used for contactless current measurement, then the device structure is simple, but measurement accuracy deteriorates due to interference from nearby current-carrying wires and sensitivity to wire placement
Solution Approach 1:
The patent divides the measurement task into multiple independent sensor measurements. Instead of using a single sensor, multiple magnetic sensors (at least two) are employed to measure magnetic field components in different directions. Each sensor provides a separate measurement that contributes to the overall current calculation, thereby segmenting the measurement function to improve accuracy while maintaining manageable device complexity
Solution Approach 2:
The patent transitions from single-dimensional measurement to multi-dimensional measurement by arranging sensors to detect magnetic field components in different spatial directions. This dimensional expansion allows the system to distinguish between currents in different wires and reduces sensitivity to precise wire placement, resolving the contradiction between measurement precision and device complexity
2Measurement precision
If magnetic sensors are positioned to achieve accurate single-wire measurement, then measurement precision improves, but adaptability deteriorates due to inability to measure multiple wires simultaneously
Solution Approach 1:
The patent designs the magnetic sensor array to perform multiple functions simultaneously. The same set of sensors used for precise single-wire measurement also enables multi-wire current measurement by detecting magnetic field components from multiple conductors. This multi-functionality resolves the contradiction by making the measurement system adaptable to both single-wire and multi-wire scenarios without sacrificing precision
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (direction, magnitude) to distinguish between multiple wires. By measuring magnetic field components in different directions and using computational algorithms to separate the contributions of individual wires, the system maintains measurement precision while achieving versatility in measuring multiple conductors simultaneously
3Ease of operation
If the measurement apparatus is made compact for use in tight spaces, then ease of operation improves, but measurement precision deteriorates due to reduced sensor separation and increased interference
Solution Approach 1:
The patent compensates for reduced physical separation in compact devices by measuring in multiple spatial dimensions. Even when sensors are closely spaced, the multi-dimensional measurement capability allows the system to distinguish between different wire positions and maintain measurement accuracy, thereby resolving the contradiction between compactness and precision
Solution Approach 2:
The patent replaces the mechanical solution of physically separating sensors over large distances with a computational approach. By using algorithms to process multi-dimensional magnetic field data and separate contributions from different wires, the system achieves measurement precision without requiring large physical sensor separations, enabling compact device design
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 solution provides accurate and simultaneous measurement of current in multiple wires without precise placement, reduces interference, and expands the measurement zone, enabling effective current measurement in complex conductor configurations.
Implementation Method 1
magnetic sensor pairs arranged within a housing to generate signals indicative of magnetic fields in multiple directions
Data Source
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AI summary
Embodiments of the present disclosure provide mechanisms for measuring currents flowing in one or more conductor wires. The mechanisms are based on using magnetic sensor pairs arranged within a housing with an opening for the wires, where each magnetic sensor pair can generate a pair of signals indicative of magnetic fields in two different directions. The outputs of the sensor pairs can be used to derive a measure of current(s) flowing through the one or more wires. The use of magnetic sensor pairs that can measure magnetic field in two different directions may enable simultaneous current measurement in multiple wires placed within the opening, improve accuracy of current measurements while relaxing requirements for precise control of the placement of the wire(s), reduce the impact of stray magnetic interference, and enable both AC and DC measurements.