Dual-Conductor Current Sensor Layout for Noise-Canceling Measurement
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Solution Overview
Problem
Existing current sensors face challenges in accurately measuring multiple channels of current while minimizing noise interference and reducing heat generation, particularly in three-phase AC circuits.
Innovation Solution
A current sensor design incorporating two current conductors for measuring target currents from different phases, utilizing magnetoelectric conversion elements and a signal processing IC to cancel noise components, and a sealing section to minimize heat and size, with a layout that optimizes wire connections and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple current conductors are arranged closely to measure multiple channels, then measurement capability is improved, but noise interference increases
Solution Approach 1:
A magnetic shield is introduced as an intermediary component between current conductors to block magnetic field interference. The shield prevents magnetic flux from one conductor from affecting other conductors, thereby reducing noise interference while maintaining close spacing for multi-channel measurement capability.
Solution Approach 2:
The current sensor is divided into separate measurement channels with individual current conductors and magnetoelectric conversion elements. Each channel is independently structured, allowing precise measurement of multiple currents while the segmentation helps isolate electromagnetic interference between channels.
2Measurement precision
If signal processing IC and magnetoelectric conversion elements are placed close to current conductors, then measurement precision is improved, but heat generation increases
Solution Approach 1:
The patent applies different functional zones within the sensor structure. The magnetoelectric conversion elements are positioned close to current conductors for high-precision measurement, while the signal processing IC is placed in a separate zone with better thermal management. The magnetic shield creates localized protection zones that allow close positioning of sensitive elements without exposing them to excessive heat from the IC.
3Adaptability or versatility
If wire connections are extended to connect magnetoelectric conversion elements to signal processing IC, then measurement capability is improved, but noise from external magnetic fields increases
Solution Approach 1:
The magnetic shield serves multiple functions simultaneously: it blocks external magnetic field noise from affecting the magnetoelectric conversion elements, guides magnetic flux from current conductors to the conversion elements, and provides structural support for positioning components. This multi-functionality allows extended wire connections for measurement capability while protecting against magnetic noise.
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 design achieves precise current measurement for two channels with reduced noise interference and heat generation, enabling a compact and efficient current sensor module.
Implementation Method 1
a magnetoelectric conversion element which detects a magnetic field that is generated by a measuring target current
Data Source
AI summary
A sealing section seals a part of the first current conductor, the first magnetoelectric conversion element, a part of the second current conductor, the second magnetoelectric conversion element, the signal processing IC, and a part of the signal conductor. At least one of the first magnetoelectric conversion element or the second magnetoelectric conversion element may be arranged on a circuit surface of the signal processing IC. A part of the first current conductor may be exposed from a first surface of the sealing section. A part of the second current conductor may be exposed from a second surface which is opposite to the first surface of the sealing section in a first direction. A part of the signal conductor may be exposed from a third surface which is different from the first surface and the second surface of the sealing section.