Electric Equipment Sensor Layout for Magnetic Field Interference
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Solution Overview
Problem
Existing electric equipment designs lack consideration for the layout of components such as Hall elements and reactors in relation to magnetic field generation sources, leading to restricted design freedom and increased detection errors in electric current sensors.
Innovation Solution
The design includes a reactor with winding parts on the same virtual plane, a bus bar connecting these parts, a switching element on a substrate, and an electric current sensor with a detection element and annular core, where the sensor is shifted from the reactor and the substrate is parallel to the virtual plane, reducing interlinkage of AC magnetic fields and improving detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sensor substrate is positioned close to the reactor for compact layout, then the size of electric equipment is reduced, but detection errors increase due to AC magnetic field interlinkage
Solution Approach 1:
The patent positions the sensor substrate in a different spatial dimension relative to the reactor. Specifically, the sensor substrate is arranged perpendicular to the plane containing the reactor's winding axes, with the detection element facing the reactor through the annular core. This dimensional arrangement minimizes AC magnetic field interlinkage while maintaining compact overall size, as the magnetic field lines generated by the reactor do not effectively couple with the sensor substrate in this orientation.
2Measurement precision
If the sensor substrate is positioned far from the reactor to reduce magnetic field interlinkage, then detection accuracy improves, but design freedom is restricted and device size increases
Solution Approach 1:
The patent employs a flexible bus bar structure with multiple plate parts that can be dynamically positioned and configured. The bus bar includes a first plate part, second plate part, third plate part, and fourth plate part that can be arranged in different configurations to accommodate various design requirements. This dynamic configurability allows the sensor substrate to be positioned optimally for both compactness and detection accuracy without restricting design freedom.
3Ease of manufacture
If traditional substrate layout is used without considering magnetic field generation sources, then manufacturing is simplified, but detection errors occur due to AC magnetic field interlinkage
Solution Approach 1:
The patent incorporates the detection element within the annular core structure of the sensor substrate, which is designed to face the reactor through the core. This preliminary positioning of the detection element within the magnetic circuit path allows the sensor to accurately detect magnetic flux generated by the reactor while the annular core provides magnetic shielding that reduces the impact of AC magnetic field interlinkage. This design integrates magnetic field consideration into the manufacturing process from the beginning.
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 allows for size reduction of electric equipment, suppression of detection errors, and enhanced design flexibility by minimizing the interlinkage of AC magnetic fields with the sensor substrate, thereby improving detection sensitivity and reducing component count.
Implementation Method 1
a Hall element 10... Power supply voltage is applied to the power supply terminal td in a manner that magnetic flux Φ can be detected. The output terminal 'to' outputs an output signal in correspondence with the detected magnetic flux Φ
Implementation Method 2
an annular core having a gap for providing the detection element
Data Source
AI summary
In electric equipment, a switching substrate is provided along winding axes of winding parts. A part of the switching substrate is overlapped with a reactor, as viewed in a direction perpendicular to a virtual plane including the winding axes. Further, an electric current sensor is shifted from the reactor in a direction of winding axes, and a sensor substrate is provided in parallel to the virtual plane.