Current Detecting Apparatus Housing for Circuit Board Positioning
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Solution Overview
Problem
Current detecting apparatuses in vehicles face accuracy issues due to circuit board deflection caused by temperature changes and difficulties in accurately assembling elongated magnetic lead terminals, leading to positional displacement between magnetoelectric devices and magnetic cores, which deteriorates current detection accuracy.
Innovation Solution
A current detecting apparatus with a housing that includes substrate fixing and holding portions to securely position the circuit board and magnetic core, along with connector positioning to stabilize the connector and reduce external force influence, ensuring precise alignment and minimizing deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a general-purpose connector is mounted on the circuit board, then ease of manufacture is improved, but the circuit board is susceptible to deflection causing deterioration of current detection accuracy
Solution Approach 1:
The housing is divided into a body portion and a lid portion that can be assembled separately. The circuit board is secured to the body portion before assembling the lid, allowing the connector to be mounted on a stable substrate without causing deflection that would affect detection accuracy.
Solution Approach 2:
The circuit board is secured to the housing body in advance before the lid is assembled. This preliminary securing prevents deflection when the connector is later mounted and connected, ensuring the magnetoelectric device maintains accurate positioning relative to the magnetic core.
2Adaptability or versatility
If the circuit board is made large to accommodate components, then device functionality is improved, but the circuit board becomes more susceptible to deflection
Solution Approach 1:
The housing is segmented into body and lid portions, with the circuit board secured to the body portion. This segmentation provides a stable mounting surface that reduces deflection while still accommodating all necessary components including the magnetoelectric device, magnetic core, and connector.
Solution Approach 2:
The housing body acts as an intermediary structure between the circuit board and the external environment. It provides rigid support and positioning features that stabilize the circuit board, preventing deflection while allowing the board to maintain its functional layout.
3Reliability
If elongated magnetic lead terminals are assembled to the housing, then electrical connectivity is improved, but it becomes difficult to attach them with high positional accuracy
Solution Approach 1:
The magnetoelectric device is secured to the circuit board before assembling the housing lid. This preliminary positioning ensures that the elongated magnetic lead terminals are correctly positioned relative to the magnetic core, achieving both electrical connectivity and manufacturing precision.
Solution Approach 2:
The housing body is designed with pre-formed recesses and positioning features that replicate the ideal positional relationship between the magnetoelectric device and magnetic core. This copying of the optimal configuration into the housing structure ensures high positional accuracy during assembly.
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 solution effectively reduces positional displacement and improves current detection accuracy by stabilizing the circuit board and connector, enhancing the apparatus's reliability and manufacturing ease.
Implementation Method 1
a magnetoelectric device configured to detect a magnetic flux in the gap portion of the magnetic core and output an electric signal
Data Source
AI summary
In a current detecting apparatus, a container member includes a substrate fixing portion, a core inner-edge positioning portions, and a lid member. The substrate fixing portion is a portion formed at a position outside an outer edge of a magnetic core, and to which a first portion of a circuit board is fixed. Two of the core inner-edge positioning portions come into contact with the magnetic core, and come into contact with the circuit board. The first portion, the second portion, and the third portion surround a magnetoelectric device, such as a Hall element, that detects a magnetic flux in a gap portion of the magnetic core. The lid-side substrate holding portion, with the container-side substrate holding portion, holds the circuit board tightly.