PCB-to-Base Plate Epoxy Connection for Heat Transfer and Insulation
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Solution Overview
Problem
Existing control units require separate components like pressure sensitive adhesive (PSA) or thermally conductive adhesive (TCA) and fasteners to attach a printed circuit board (PCB) to a heat sink, which increases material and manufacturing costs and complexity.
Innovation Solution
A control unit with a connection structure that uses an overmolding process with epoxy material to connect the PCB to a base plate, eliminating the need for additional adhesives or fasteners. The epoxy material serves as both a heat transfer layer and an electrical insulation layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components like PSA or TCA and fasteners are used to attach PCB to heat sink, then reliable connection and heat transfer are achieved, but material cost and manufacturing complexity increase
Solution Approach 1:
The patent combines multiple functions (mechanical attachment, thermal transfer, and electrical insulation) into a single integrated epoxy molding compound structure. The EMC serves as both the attachment medium and functional layer, eliminating the need for separate adhesives and fasteners while maintaining connection reliability and heat transfer efficiency.
Solution Approach 2:
The epoxy molding compound performs multiple functions simultaneously: it provides mechanical bonding between PCB and heat sink, transfers heat from the PCB to the heat sink, and provides electrical insulation. This multi-functionality reduces the number of components needed while achieving reliable connection and thermal management.
2Temperature
If separate components like PSA or TCA are used to attach PCB to heat sink, then thermal transfer is achieved, but material cost increases
Solution Approach 1:
The patent integrates the thermal transfer function into the epoxy molding compound itself, which is already present in the assembly for encapsulation purposes. By incorporating thermally conductive fillers into the EMC, the same material that provides structural support and insulation also serves as the thermal interface, eliminating the need for separate thermally conductive adhesives.
Solution Approach 2:
The epoxy molding compound is designed to perform multiple functions including mechanical support, electrical insulation, and thermal transfer. This multi-functionality reduces the total material quantity needed while maintaining effective heat transfer from the PCB to the heat sink through the integrated thermal pathways in the EMC.
3Device complexity
If overmolding process with epoxy material is used to connect PCB to base plate, then material cost and manufacturing complexity are reduced, but electrical insulation and heat transfer performance must be maintained
Solution Approach 1:
The epoxy molding compound is formulated with specific local properties: high electrical insulation performance in the bulk material and enhanced thermal conductivity through the addition of conductive fillers in the regions adjacent to the PCB and heat sink. This localized optimization ensures both electrical insulation and heat transfer requirements are met while maintaining assembly simplicity.
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 solution provides effective heat transfer from the PCB to the base plate while ensuring electrical insulation, reducing material and manufacturing costs, and simplifying the assembly process without compromising robustness or packaging.
Implementation Method 1
The epoxy material transfers heat from the PCB to the baseplate (i.e., heat is transferred from the surface of the PCB in contact with the layer of epoxy to the surface of the base plate in contact with the layer of epoxy)
Implementation Method 2
a connection structure to connect the PCB to the base plate. The epoxy material transfers heat from the PCB to the baseplate, and electrically insulates the PCB from the base plate
Data Source
AI summary
A control unit having a connection structure for connecting components of the control unit to a base plate which is cost effective, and facilitates heat transfer from a printed circuit board (PCB) to the base plate. The control unit includes circuitry mounted to a PCB, and the PCB is mounted to a base plate. The circuitry is over molded with epoxy material during manufacturing. The epoxy material flows between the PCB and the base plate, such that a layer of the epoxy is disposed between the PCB and the base plate. This layer of epoxy functions as a heat transfer layer, and a connection structure to connect the PCB to the base plate. The epoxy material transfers heat from the surface of the PCB in contact with the layer of epoxy to the surface of the base plate in contact with the layer of epoxy.