SMD Capacitor Mounting Plate With Metal Heat Transfer Element
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Solution Overview
Problem
Standard SMD capacitors have poor mechanical fixation and limited thermal dissipation to a printed circuit board due to their band wires, which hinder efficient heat transfer and soldering processes.
Innovation Solution
Incorporating a metal element between the capacitor case and mounting plate, which protrudes through the mounting plate, allows for thermal and mechanical connection to the PCB, enhancing heat transfer and mechanical fixation during surface mounting and normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If band wires are used for mechanical fixation in standard SMD capacitors, then the capacitor can be mounted to PCB, but the mechanical fixation is poor and thermal dissipation is limited
Solution Approach 1:
A metal element is introduced as an intermediary component between the capacitor case and the mounting plate. This metal element serves dual functions: it provides robust mechanical fixation through protruding parts that extend through the mounting plate to contact the PCB, and it enables efficient thermal dissipation by conducting heat from the capacitor case to the PCB. The metal element acts as a mediator that simultaneously resolves both the mechanical fixation and thermal dissipation limitations of standard band wire designs.
2Productivity
If band wires are used for connection, then the capacitor can be mounted to PCB, but the soldering process is slow due to limited heat transfer
Solution Approach 1:
The metal element serves as a thermal intermediary that accelerates the soldering process. During reflow soldering, heat applied to the capacitor case is rapidly conducted through the metal element to the PCB and solder joints, significantly reducing the time required to reach soldering temperatures. This intermediary thermal pathway bypasses the limitation of heat transfer through thin band wires, enabling faster and more reliable soldering.
3Temperature
If the case is directly fixed to the mounting plate, then the structure is simple, but the thermal connection to PCB is insufficient
Solution Approach 1:
The metal element is positioned between the case and the mounting plate to create an optimized thermal pathway. While this adds one component to the structure, it significantly enhances thermal connection to the PCB. The metal element's high thermal conductivity and direct contact with both the case and PCB create an efficient heat dissipation path that outweighs the minor increase in structural complexity.
Solution Approach 2:
The metal element performs multiple functions simultaneously: it provides mechanical fixation through its protruding parts, conducts heat from the capacitor case to the PCB, and serves as a structural support element. This multi-functionality justifies the addition of the metal element, as it replaces what would otherwise require separate components for mechanical fixation and thermal management.
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 metal element accelerates the soldering process by transferring heat to solder pads and acts as a heatsink, improving mechanical and thermal connection, thus addressing the limitations of standard SMD capacitors.
Implementation Method 1
the metal element can be thermally contacted to the case. Thus, during surface mounting, for example by reflow soldering, heat collected by the case can be transferred via the metal element to a PCB
Data Source
AI summary
In an embodiment a capacitor includes a winding element arranged in a case, a mounting plate which has a non-conductive material and which is fixed to the case and a metal element arranged between the case and the mounting plate, wherein the metal element includes a protruding part protruding through the mounting plate.