Multi-Coil Current Detection Device for Noise-Resistant Sensing
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Solution Overview
Problem
Conventional current detection devices face challenges in accurately detecting small magnetic fields generated by coils due to limited amplification factors in amplification circuits, which can lead to noise interference and decreased performance.
Innovation Solution
A current detection device comprising two or more plane-shaped coil patterns with a magnetic field detection element isolated orthogonally to the coil patterns, and a driving circuit that amplifies the output signals, with the coil patterns designed to maximize magnetic flux density, allowing for effective detection of currents while minimizing noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the amplification factor of the amplification circuit is increased to detect small magnetic fields, then the detection sensitivity is improved, but noises enter into the driving circuit of the Hall element and performance decreases
Solution Approach 1:
The patent transitions from a single-coil configuration to a multi-coil array configuration, adding spatial dimensionality to the system. This allows the magnetic field detection to be distributed across multiple sensing points, enabling signal differentiation and noise rejection through spatial processing without requiring excessive amplification gain.
Solution Approach 2:
The patent introduces signal processing circuits that act as intermediaries between the Hall elements and the output. These circuits process the signals from multiple Hall elements, performing operations such as differential amplification and noise filtering, which allows for improved detection sensitivity without directly amplifying noise in the traditional single-path approach.
2Measurement precision
If conventional amplification circuits are used to amplify small magnetic field signals, then detection capability is improved, but device complexity and noise interference increase
Solution Approach 1:
The patent combines multiple Hall elements and their associated driving circuits into an integrated array configuration. By merging the detection functions of multiple elements and processing their signals collectively, the system achieves improved detection capability while managing complexity through unified circuit architecture and shared signal processing pathways.
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 enhances magnetic flux density detection, improving the accuracy and reliability of current detection without increasing device size, even at higher frequencies, by optimizing the winding number and configuration of the coil patterns.
Implementation Method 1
A current detection device detects a current by flowing a current to be detected through a coil, and detecting a magnetic field generated from the coil
Implementation Method 2
The generated magnetic field is detected by, for example, a Hall element
Data Source
AI summary
A current detection device includes a plane-shaped first coil pattern having a winding number of at least two or more, a magnetic field detection element isolated from the first coil pattern in a direction orthogonal to a plane of the first coil pattern, and arranged to receive a magnetic field formed by the first coil pattern, a driving circuit configured to drive the magnetic field detection element and output an output signal, a second coil pattern, a first substrate on the first coil pattern, a second substrate on the second coil pattern, and a third substrate on the magnetic field detection element. The magnetic field detection element is provided between the first coil pattern and the second coil pattern.