Smart Plug Thermal Management via 3D PCB Partitioning
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Solution Overview
Problem
Traditional smart plugs face challenges in maintaining robustness and managing high current loads while reducing size, leading to potential overheating and failure during maximum load conditions.
Innovation Solution
The smart plug is partitioned into multiple printed circuit boards (PCBs) in a three-dimensional configuration, with thick copper foils for heat dissipation and a computing device that identifies attached devices to manage current limits based on their characteristics, ensuring safe operation under high loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the smart plug size is reduced, then the compactness is improved, but the internal temperature increases due to heat dissipation issues
Solution Approach 1:
The patent partitions the smart plug into multiple PCBs arranged in a three-dimensional configuration rather than a flat two-dimensional layout. This spatial redistribution allows heat to dissipate more effectively through the three-dimensional structure, preventing heat concentration in a single plane while maintaining a compact overall form factor.
Solution Approach 2:
The smart plug is divided into multiple separate PCBs (power PCB, relay PCB, main PCB) instead of using a single large PCB. This segmentation distributes the heat-generating components across multiple smaller boards, improving heat dissipation surface area and reducing internal temperature while maintaining compact size.
2Temperature
If thick copper foils are used to reduce heat dissipation, then the temperature control is improved, but the device complexity increases
Solution Approach 1:
The patent specifies copper foil thickness within a particular range (0.1mm to 1.0mm) rather than using a single fixed thickness. This parameter optimization allows sufficient heat dissipation capability while avoiding excessive thickness that would unnecessarily increase complexity and material usage. The range provides flexibility to adjust based on specific application requirements.
3Reliability
If the smart plug manages current limits based on device characteristics, then the safety is improved, but the computing complexity increases
Solution Approach 1:
The smart plug determines electrical characteristics (including current limits and transient behavior duration) of the attached device before applying current management. By pre-identifying device type and retrieving its characteristics from a data structure, the system prepares the appropriate current management parameters in advance, enabling safe operation without requiring complex real-time calculations during high-load conditions.
Solution Approach 2:
The patent replaces complex real-time current management calculations with a lookup-based approach. Instead of computing current limits dynamically, the system uses a data structure that maps device identification to pre-stored electrical characteristics. This substitution of computation with data retrieval simplifies the computing requirements while maintaining safety under high loads.
4Volume of moving object
If multiple PCBs are used to reduce size, then the compactness is improved, but the manufacturing complexity increases
Solution Approach 1:
The smart plug is divided into multiple standardized PCBs (power PCB, relay PCB, main PCB) that can be manufactured independently using standard PCB fabrication processes. Each PCB can be produced separately and then assembled into the final three-dimensional configuration, making manufacturing more flexible and scalable compared to a single custom-designed large PCB.
Solution Approach 2:
The multiple PCBs are designed with standardized interfaces and mounting configurations that can accommodate different device variations. This universal design approach allows the same basic PCB structures to be used across different smart plug models, simplifying manufacturing by reusing proven designs rather than creating entirely new PCBs for each application.
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 design enhances the smart plug's robustness and safety by effectively managing heat dissipation and current limits, allowing it to operate reliably under maximum load conditions without overheating.
Implementation Method 1
a metal foil transfers heat from contact metal on a PCB to a side wall of a plastic housing of the smart plug
Data Source
AI summary
A smart plug that is partitioned into a plurality of printed circuit boards (PCBs) in a three dimensional manner to reduce its size. Aspects consider the effect of the possible increased internal temperature as the size of the smart plug is reduced. For example, thick metal foils connect various components of a smart plug to reduce heat dissipation within the smart plug. Also, a metal foil may transfer heat from contact metal on a PCB to a side wall of a plastic housing of the smart plug. The smart plug may comprise a computing device that obtains information identifying the attached electrical device and accesses device data about the time duration during which the attached electrical device exhibits transient characteristics. The computing device then uses the accessed data to effectively control the attached electrical device.