Power Converter Current Sensor Layout Against Magnetic Flux Interference
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Solution Overview
Problem
Current sensors with two magnetic sensors face challenges in accurately detecting electric current due to external magnetic flux interference, particularly when the sensors are positioned in a direction that aligns with the external magnetic flux generated by adjacent wiring, leading to decreased detection accuracy.
Innovation Solution
The electric power converter positions the first and second sensor elements of the current sensor in a radial direction relative to the coil, avoiding alignment with the external magnetic flux, which is typically flattened and extends in the axial direction, thereby reducing interference and enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor elements are positioned to detect magnetic flux in a direction aligned with external magnetic flux from adjacent wiring, then the detection sensitivity to current-generated magnetic flux is improved, but the detection accuracy deteriorates due to interference from external magnetic flux
Solution Approach 1:
The patent applies dimensionality change by transitioning from a one-dimensional linear arrangement of sensor elements to a two-dimensional radial arrangement. The first and second sensor elements are positioned at different radial distances from the coil axis, creating a spatial configuration where the detection directions diverge in the radial dimension. This dimensional transition allows the sensor elements to detect magnetic flux components in different spatial orientations, thereby reducing the impact of external magnetic flux that primarily extends in the axial direction while maintaining sensitivity to current-generated magnetic flux.
Solution Approach 2:
The patent employs asymmetry by positioning the sensor elements at asymmetric radial distances from the coil axis. The first sensor element is located at a different radial position than the second sensor element, creating an asymmetric detection geometry. This asymmetric arrangement ensures that the sensor elements experience different magnetic flux densities and directions, allowing differential detection that cancels out external magnetic flux interference while preserving sensitivity to the target current signal.
2Measurement precision
If the sensor elements are positioned close to the coil for high detection sensitivity, then the detection capability is improved, but the exposure to external magnetic flux from the coil itself increases
Solution Approach 1:
The patent uses dimensionality change by arranging sensor elements in the radial dimension rather than solely in the axial dimension. By positioning sensor elements at different radial distances from the coil axis, the patent creates a detection geometry that samples magnetic flux in multiple radial directions. This dimensional approach allows the sensor elements to detect the flattened magnetic flux pattern generated by the coil while the differential measurement configuration cancels out the interference, maintaining high sensitivity without excessive exposure.
Solution Approach 2:
The patent introduces an intermediary detection mechanism by using multiple sensor elements at different radial positions as intermediaries to sample the magnetic flux field. These sensor elements act as intermediaries that convert the complex three-dimensional magnetic flux distribution into measurable signals that can be differentially processed. The intermediary sensor elements enable the system to distinguish between useful magnetic flux signals and harmful interference by comparing measurements from different radial positions.
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 inhibits opposite detection directions of the external magnetic flux by the sensor elements, improving the accuracy of current detection in the current sensor.
Implementation Method 1
The first sensor element and the second sensor element are disposed in a radial direction of the coil. Each of the first sensor element and the second sensor element detects a magnetic flux that is a detected magnetic flux generated by a current flowing through the electrically conductive portion
Data Source
AI summary
An electric power converter converts electric power supplied from a power supply to an electrical load. The electric power converter includes a coil, an electrically conductive portion and a current sensor. The coil extends in an axial direction of the coil. The coil allows a current to flow through the coil. The electrically conductive portion is located at a position apart from the coil. The electrically conductive portion allows the current to flow through the electrically conductive portion. The current sensor detects the current flowing through the electrically conductive portion. The current sensor includes a first sensor element and a second sensor element, each of which detects a magnetic flux being a detected magnetic flux generated by the current flowing through the electrically conductive portion. The first sensor element and the second sensor element are disposed in a radial direction of the coil.