Elevated Temperature Sensor for Network Device Thermal Decoupling
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Solution Overview
Problem
Conventional surface-mounted digital temperature sensors on network devices suffer from accuracy loss due to external influences from nearby electrical components and thermal dissipation from the PCB, making them ineffective for measuring ambient temperatures accurately.
Innovation Solution
The temperature sensor is elevated or raised above the surface of the printed circuit board, using a connector port to protrude from the board, with thermal isolation features like cutouts and an exposed metal pad to measure ambient temperature more accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the temperature sensor is mounted directly on the PCB surface, then the device complexity is reduced and manufacturing is simplified, but the measurement precision deteriorates due to thermal dissipation from the PCB and external influence from nearby electrical components
Solution Approach 1:
The temperature sensor is elevated from the PCB surface by mounting it on a support structure that extends vertically from the board. This dimensional transition from 2D surface mounting to 3D elevated positioning removes the sensor from the thermal influence zone of the PCB, allowing accurate ambient temperature measurement while maintaining electrical connectivity through conductive elements in the support structure
Solution Approach 2:
A support structure acts as an intermediary between the PCB and the temperature sensor. This intermediary structure provides mechanical support, electrical connectivity through conductive elements, and thermal isolation by positioning the sensor away from heat-generating components on the PCB, thus resolving the contradiction between measurement accuracy and device complexity
2Measurement precision
If the temperature sensor is elevated above the PCB surface using a support structure, then the measurement precision improves by reducing thermal influence from the PCB and nearby components, but the device complexity increases due to additional mounting components
Solution Approach 1:
The support structure integrates multiple functions into a single component: mechanical support for the sensor, electrical connectivity through embedded conductive elements, and thermal isolation by maintaining spatial separation from heat-generating components. This merging reduces the number of separate components needed, offsetting the complexity increase from elevation
Solution Approach 2:
The elevated support structure serves multiple purposes simultaneously: it provides mechanical mounting for the temperature sensor, establishes electrical connections via conductive pathways, and creates thermal isolation from the PCB. This multi-functionality justifies the added structural complexity by delivering comprehensive performance benefits
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 elevated temperature sensor design reduces the influence of surface temperatures, providing more accurate readings of the ambient temperature within the network device housing.
Implementation Method 1
thermal dissipation from the PCB itself
Data Source
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AI summary
A network device that includes a temperature sensor module is provided. The network device can include a host printed circuit board, one or more processors mounted on a surface of the host printed circuit board, a port protruding from the surface of the host printed circuit board, and a temperature sensor module that is raised over the surface of the host printed circuit board to provide thermal decoupling from the surface of the host printed circuit board. The temperature sensor module can include a sensor printed circuit board, a temperature sensor integrated circuit die disposed on a first side of the sensor printed circuit board, and an exposed conductive pad disposed on a second side of the sensor printed circuit board. The temperature sensor module can include multiple exposed contacts or a plug configured to mate with the protruding port.