Circuit Board Electrostatic Charge Absorbing Conductor Design
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Solution Overview
Problem
Conventional circuit boards for automotive ECUs fail to effectively absorb electrostatic charges due to insulation films on wiring, leading to direct penetration of static charges into ICs, causing damage.
Innovation Solution
A circuit board design featuring an input terminal, first and second lands, and an electrostatic-charge absorbing conductor with a shorter distance between the conductor and the first land, allowing effective absorption of electrostatic charges through the first land, preventing damage to electric parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wirings are coated with insulation films to prevent noise and static charge penetration, then electrical insulation is improved, but electrostatic charge absorption capability deteriorates
Solution Approach 1:
The circuit board structure is segmented into functional zones: signal input terminals, electrostatic-charge absorbing conductors positioned at specific distances from lands, and ground connections. This segmentation allows the insulation film to cover most wirings while leaving specific areas (where the absorbing conductors are positioned) capable of charge absorption, thus resolving the contradiction between insulation and charge absorption
Solution Approach 2:
The electrostatic-charge absorbing conductor acts as an intermediary element between the insulated wirings and the ground. It is positioned at a specific distance from the land (shorter than the land-to-second-land distance) to intercept electrostatic charges before they can penetrate through the insulated wiring into the IC, while maintaining the insulation film coverage on the wiring itself
2Volume of moving object
If the distance between lands is reduced to minimize ECU size, then device compactness is improved, but electrostatic charge protection capability deteriorates
Solution Approach 1:
Instead of relying solely on the horizontal distance between lands for charge protection, the invention introduces a vertical/dimensional solution by positioning the electrostatic-charge absorbing conductor at a specific distance from the first land. This creates a multi-dimensional protection mechanism where the absorbing conductor intercepts charges in the space between the land and the IC, effective even when land-to-land distance is minimized for compact ECU design
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 effectively absorbs electrostatic charges, reducing their impact on circuit board components by directing them to the ground via the electrostatic-charge absorbing conductor, thereby protecting ICs from damage.
Implementation Method 1
an electrostatic-charge absorbing conductor for absorbing an electrostatic charge... the electrostatic charge penetrated from the input terminal is effectively absorbed into the electrostatic-charge absorbing conductor through the first land
Data Source
AI summary
A circuit board includes: an input terminal for inputting a signal from an external circuit; a first land and a second land; and an electrostatic-charge absorbing conductor for absorbing an electrostatic charge. The first land is electrically connected to the input terminal. The second land is separated from the first land by a predetermined distance therebetween. A distance between the electrostatic-charge absorbing conductor and the first land is shorter than a distance between the first land and the second land. In the circuit board, the electrostatic charge is effectively absorbed into the electrostatic-charge absorbing conductor through the first land so that the electrostatic charge is prevented from negatively affecting on electric parts on the board.