Electronic Control Housing Layout for Static Discharge Protection
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Solution Overview
Problem
Electronic control devices face failure due to static electricity discharge, as metal cases do not effectively dissipate static, potentially damaging the electronic components in high-temperature environments like engines and transmissions.
Innovation Solution
An electronic control device design featuring an insulating case with a conductive cover and base, where the distance between the conductive cover and fixture is minimized to facilitate static discharge to the fixture rather than the electronic component, reducing heat transfer and preventing component failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the case is made of metal to provide structural strength, then the strength is improved, but static electricity accumulates and cannot be discharged, causing electronic component failure
Solution Approach 1:
The case is divided into two distinct parts: an insulating case body made of resin and a separate conductive cover made of metal. This segmentation allows each part to fulfill its specific function - the insulating body prevents static accumulation while the conductive cover provides structural strength and heat dissipation.
Solution Approach 2:
The case uses a composite structure combining resin (insulating material) and metal (conductive material). The insulating case body is covered with a conductive cover, creating a composite structure that simultaneously provides electrical insulation, static discharge capability, and mechanical strength.
2Reliability
If the case is made of resin to prevent static electricity accumulation, then static discharge reliability is improved, but heat from the engine and transmission is easily transferred to electronic components
Solution Approach 1:
The case is segmented into an insulating resin body and a separate conductive metal cover. The metal cover specifically addresses the heat dissipation issue by providing a thermal conduction path away from electronic components, while the resin body maintains electrical insulation properties.
Solution Approach 2:
The composite structure of resin and metal allows the metal cover to serve as a heat sink and thermal conduction path, efficiently transferring heat away from sensitive electronic components while the resin base maintains electrical insulation.
3Reliability
If a conductive cover is added to the insulating case to enable static discharge, then static electricity discharge capability is improved, but the device structure becomes more complex
Solution Approach 1:
The conductive cover is integrated with the insulating case body to form a unified case structure. The cover fits over the insulating case, and together they form the complete protective housing, combining multiple functions in a unified structure.
Solution Approach 2:
The conductive cover serves multiple functions simultaneously: it provides static discharge capability, enhances structural strength, improves heat dissipation, and maintains the overall case integrity. This multi-functionality reduces the need for additional separate components.
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 suppresses electronic component failure from static electricity and reduces heat transfer from the engine or transmission, ensuring reliable operation in harsh environments.
Implementation Method 1
static electricity applied to the metal cover from a user's hand or the like is not discharged to the resin case. In addition, there is a concern that static electricity is discharged to the electronic component and the electronic component breaks down.
Implementation Method 2
heat of the engine, the transmission, and the like is transmitted to the electronic component on the substrate held by a case via the case (housing) of the electronic control device
Data Source
AI summary
Provided is an electronic control device capable of suppressing failure of an electronic component due to static electricity. The electronic control device 100 includes a substrate 10, an electronic component 1 mounted on the substrate 10, an insulating case 20 that holds the substrate 10, a conductive cover 30 that covers the insulating case 20, a conductive base 40 that holds the insulating case 20, and a conductive fixture 21 that fixes the insulating case 20 to the conductive base 40. A distance L1 between the conductive cover 30 and the conductive fixture 21 is equal to or less than a distance L2 between the conductive cover 30 and a conductive terminal 1a of the electronic component 1.