Smart Wall Socket Heat Dissipation via Segmented PCB Traces
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Solution Overview
Problem
Smart plugs face challenges in providing robust electrical power under high and varying current loads while minimizing temperature rise to ensure safety and efficiency, particularly in smart home applications where energy management and USB charging are integrated.
Innovation Solution
The design incorporates current sensors and relays on both Live and Neutral lines, synchronous rectifiers to replace Schottky diodes, wide and short high-current traces, DC/DC converters instead of LDO regulators, and metal heat sinks to reduce power dissipation and temperature, along with a computing device for energy measurement and wireless reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If smart plug provides substantial electrical power under high and varying current loads, then power delivery capability is improved, but temperature rise increases
Solution Approach 1:
The patent segments the power delivery path into multiple independent high-current traces instead of using a single trace. This distributes the current load across multiple parallel paths, reducing the current density and power dissipation in each individual trace, thereby reducing temperature rise while maintaining overall high power delivery capability.
Solution Approach 2:
The patent applies different trace width specifications to different PCB regions based on local current requirements. High-current traces are made wider to reduce resistance and power dissipation in areas carrying substantial current, while other areas use standard trace widths. This localized optimization reduces overall temperature rise while maintaining power delivery capability where needed.
2Measurement precision
If smart plug incorporates current sensors and relays on both Live and Neutral lines, then measurement precision and control reliability are improved, but device complexity increases
Solution Approach 1:
The patent combines the functions of current sensing, power measurement, and control into an integrated system where current sensors on both Live and Neutral lines feed into a unified measurement and control architecture. This merging of functions improves measurement accuracy by capturing complete current information while managing complexity through integrated design rather than separate independent systems.
3Loss of energy
If synchronous rectifiers replace Schottky diodes, then power efficiency is improved, but manufacturing complexity increases
Solution Approach 1:
The patent changes the electrical parameters of the rectification circuit by replacing Schottky diodes with synchronous rectifiers. This parameter change (switching from passive diode rectification to active MOSFET-based synchronous rectification) reduces power dissipation significantly by minimizing forward voltage drop, while the increased manufacturing complexity is managed through standardized component selection and integrated circuit implementation.
4Loss of energy
If wide and short high-current traces are used, then power dissipation is reduced, but PCB area increases
Solution Approach 1:
The patent segments the high-current path into multiple parallel traces rather than using a single wide trace. This segmentation achieves the dual benefit of reducing power dissipation (by distributing current and reducing I²R losses) while minimizing PCB area usage (by utilizing available space efficiently with multiple narrower traces instead of one large trace).
Solution Approach 2:
The patent utilizes the third dimension (vertical layering) by routing high-current traces across multiple PCB layers. This allows wide and short effective current paths without proportionally increasing the topological footprint on any single layer, thereby reducing power dissipation while maintaining compact PCB area utilization.
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 approach enhances safety, reduces internal temperature rise, and allows for efficient energy management and USB charging while maintaining a compact form factor, addressing the need for robust smart socket outlets in smart homes.
Implementation Method 1
metal heat sinks to reduce power dissipation and temperature
Implementation Method 2
metal heat sinks to reduce power dissipation and temperature
Implementation Method 3
synchronous rectifiers to replace Schottky diodes
Implementation Method 4
DC/DC converters instead of LDO regulators
Implementation Method 5
current sensors and relays on both Live and Neutral lines
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A smart electrical plug supports one or more electrical outlets and one or more universal serial bus (USB) outlets for charging electrical devices. Electrical power consumed through the one or more electrical outlets may be measured individually or in combination and reported via a wireless communication channel. The smart electrical plug may be implemented by a plurality of printed circuit board assemblies and distributed within a housing to reduce the effects of heat dissipation. The smart electrical plug may further reduce heat dissipation by utilizing one or more electrical circuit approaches.