Film Capacitor Fixing Structure for Moisture and Heat Dissipation
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Solution Overview
Problem
Surface mount capacitors externally covered with a laminate film face challenges in being securely fixed to a casing due to the flexibility of the laminate film, which can lead to peeling and gaps, affecting heat dissipation and reliability.
Innovation Solution
A film capacitor design that includes a laminate film covering a capacitor element with a flange and a fixing member with a main body and extending fixing part, allowing for secure attachment to a casing without the need for resin, enhancing moisture resistance and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surface mount capacitor is externally covered with a laminate film, then moisture resistance is improved, but the capacitor becomes difficult to fix to a casing due to the flexibility of the laminate film
Solution Approach 1:
The invention divides the capacitor structure into distinct functional parts: the capacitor element, the laminate film for moisture protection, and a separate fixing member for mechanical attachment. This segmentation allows each component to perform its specific function without compromising the others, resolving the contradiction between moisture resistance and ease of fixing.
Solution Approach 2:
The fixing member acts as an intermediary component between the laminate film-covered capacitor element and the casing. It provides a mechanical interface for secure attachment while not interfering with the moisture barrier function of the laminate film, thus resolving the contradiction between these two requirements.
2Reliability
If a laminate film covers the capacitor element, then moisture resistance is improved, but heat dissipation is affected due to potential peeling and gaps
Solution Approach 1:
By separating the moisture protection function (laminate film) from the mechanical attachment function (fixing member), the invention ensures that the laminate film remains intact and properly positioned, preventing peeling and gaps that would compromise both moisture resistance and heat dissipation.
Solution Approach 2:
Instead of trying to make the laminate film itself rigid or directly attached to the casing, the invention inverts the approach by using a separate fixing member to secure the capacitor assembly, thereby maintaining the flexibility and integrity of the laminate film while ensuring proper heat dissipation.
3Reliability
If a fixing member is added to secure the capacitor to a casing, then fixation reliability is improved, but device complexity increases
Solution Approach 1:
The fixing member is designed to perform multiple functions: providing mechanical attachment to the casing, maintaining the position of the laminate film, and ensuring proper heat dissipation pathways. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity while improving fixation reliability.
Data Source
AI summary
A film capacitor including: a capacitor element including a laminate of a dielectric film and an internal electrode, a first end surface electrode on a first end surface of the laminate, and a second end surface electrode on a second end surface of the laminate; a laminate film including a covering part covering the capacitor element, and a flange extending from an outer edge of the covering part; a first terminal electrode connected to the first end surface electrode inside the laminate film and exposed outside of the laminate film, and a second terminal electrode connected to the second end surface electrode inside the laminate film and exposed outside of the laminate film; and a fixing member including a main body disposed along the capacitor element inside the laminate film, and a fixing part extending from the main body and exposed to the outside of the laminate film.