Electronic Control Device Noise Leakage Prevention
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Solution Overview
Problem
High-frequency semiconductor chips in electronic control devices generate excessive electromagnetic radiation and heat, leading to noise leakage due to the impedance decrease in parasitic capacitance, which is not effectively addressed by existing shielding solutions.
Innovation Solution
The electronic control device incorporates a housing with a first and second capacitance unit, forming a noise transmission path between the housing and the substrate via thermal grease and dielectric, respectively, to prevent noise leakage while maintaining heat dissipation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermally conductive member is made thin to improve heat dissipation effect, then heat dissipation performance is improved, but noise leakage increases due to decreased impedance of parasitic capacitance
Solution Approach 1:
An electromagnetic wave shielding plate is introduced as an intermediary component between the electronic component and the external environment. The shielding plate is positioned with a specific gap distance to block electromagnetic waves while the thermally conductive member conducts heat, thus resolving the contradiction between heat dissipation and noise prevention
Solution Approach 2:
The gap distance between the electromagnetic wave shielding plate and the electronic component is optimized to a specific range. This parameter change allows the shielding plate to effectively block electromagnetic waves while maintaining adequate heat dissipation through the thermally conductive member
2Speed
If a semiconductor chip operates at high frequency to improve calculation performance, then processing speed is improved, but electromagnetic radiation and heat generation increase
Solution Approach 1:
The electromagnetic waves generated by the high-frequency semiconductor chip are converted into a beneficial heat dissipation mechanism. The shielding plate reflects and redirects these electromagnetic waves toward the heat dissipation structure, transforming the harmful radiation into useful thermal energy for driving heat away from the chip
Solution Approach 2:
The electromagnetic wave shielding plate serves multiple functions simultaneously: it blocks external electromagnetic interference, reflects internal electromagnetic waves for heat dissipation, and provides a thermal conduction path. This multi-functionality resolves the contradiction by making the harmful electromagnetic radiation serve a useful purpose
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 effectively prevents noise leakage from the electronic control device while ensuring efficient heat dissipation, even at high operating frequencies, by forming a noise current path with lower impedance through the internal structure rather than the external components.
Implementation Method 1
a first capacitance unit formed between the housing and the electronic component
Implementation Method 2
a second capacitance unit formed between the housing and the substrate
Data Source
AI summary
An electronic control device includes a housing that stores a substrate on which an electronic component is mounted, a first capacitance unit formed between the housing and the electronic component, and a second capacitance unit formed between the housing and the substrate, in which a noise transmission path is formed between the housing and the substrate via the first capacitance unit and the second capacitance unit.