Coreless Current Sensor Layout Against Adjacent Magnetic Flux

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Solution Overview

Problem

Existing current sensors face limitations in detection accuracy due to interference from external magnetic flux generated by adjacent conductors, necessitating the use of multiple magnetic sensors and reducing the degree of freedom in design.

Innovation Solution

A current detection device with a first conducting portion and a current sensor positioned orthogonally to a second conducting portion, where the current sensor detects magnetic flux generated by the first conducting portion while being shielded from the magnetic flux of the second conducting portion, using a coreless type current sensor without a magnetism collecting core.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a current sensor is positioned close to a conductor for accurate detection, then detection accuracy improves, but interference from external magnetic flux generated by adjacent conductors increases

Engineering Contradiction:

Improvecurrent detection accuracyVSAvoidexternal magnetic flux interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent positions the current sensor in a direction orthogonal to the conductor, utilizing the third spatial dimension to achieve both close proximity for accurate detection and separation from adjacent conductors to minimize external magnetic flux interference. This orthogonal arrangement allows the sensor to detect the magnetic field generated by the target conductor while being spatially separated from other conductors that would generate interfering magnetic fields.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Measurement precision

If multiple magnetic sensors are used to compensate for external magnetic flux interference, then detection accuracy improves, but device complexity increases

Engineering Contradiction:

Improvecurrent detection accuracyVSAvoidsensor configuration complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates the magnetism collecting core from the sensor structure, transitioning to a coreless current sensor design. This removal of the core component simplifies the device structure while maintaining the ability to detect current through the magnetic field generated by the conductor, avoiding the need for multiple sensors to compensate for interference.

Inventive Principle:

Principle #2Taking out (Extraction)

3Adaptability or versatility

If a coreless type current sensor is used without a magnetism collecting core, then design flexibility increases, but sensitivity to weak magnetic fields may decrease

Engineering Contradiction:

Improvedesign flexibilityVSAvoidmagnetic field detection sensitivity

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent changes the physical parameters of the sensor by eliminating the magnetism collecting core and repositioning the sensor element in an orthogonal direction. This parameter change enables the sensor to operate effectively in applications requiring high design flexibility and spatial arrangement, while the orthogonal positioning compensates for sensitivity requirements by optimizing the detection geometry.

Inventive Principle:

Principle #35Parameter changes

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

Enhances detection accuracy by minimizing interference from adjacent conductors, allowing for improved current measurement without the need for multiple sensors and increasing design flexibility.

Implementation Method 1

The current sensor includes a sensor element which detects a magnetic flux generated by the electric current flowing through the first conducting portion

Methodology Applied

Scientific EffectMagnetic flux detection: Electromagnetic Induction

Data Source

PatentUS12535510B2Current detection device, current sensor, and electric power conversion device

Publication Date: 2026.01.27 DENSO CORP

AI summary

A current detection device detects an electric current. The current detection device includes a first conducting portion, a second conducting portion, and a current sensor. An electric current flows through the first conducting portion in a specific direction. The second conducting portion is provided at a position separated from the first conducting portion in the specific direction and through which an electric current flows in the specific direction. The current sensor detects an electric current flowing through the first conducting portion. The current sensor is located at a position aligned with the first conducting portion in an orthogonal direction orthogonal to the specific direction and separated from the second conducting portion in the specific direction. The current sensor includes a sensor element which detects a magnetic flux generated by the electric current flowing through the first conducting portion and an element protector which protects the sensor element.