PCB Dielectric Leakage Sensing for Accurate Temperature Monitoring
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Solution Overview
Problem
Existing temperature monitoring systems in electronic systems, such as computers and servers, often rely on discrete sensors that provide inaccurate temperature readings due to their location-specific measurements, leading to potential hardware damage or data integrity issues from thermally-induced conditions.
Innovation Solution
Implementing a characterized dielectric within the PCB or flexible circuit that acts as a temperature-dependent resistor, integrated with a leakage measurement circuit to convert current leakage into a voltage proportional to temperature, allowing for accurate temperature sensing and responsive actions when thresholds are exceeded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If discrete temperature sensors are used for temperature monitoring, then temperature measurement capability is provided, but measurement accuracy deteriorates due to location-specific readings and potential thermal coupling with heat-producing devices
Solution Approach 1:
The dielectric material itself serves as the temperature sensor by utilizing its inherent temperature-dependent electrical leakage properties. The existing PCB dielectric structure performs the sensing function without requiring separate discrete sensors, eliminating placement and calibration issues while providing accurate temperature readings that reflect the actual thermal state of the PCB and adjacent devices
Solution Approach 2:
The patent exploits the change in electrical leakage current through the dielectric material as temperature changes. By measuring the leakage current at different temperatures and establishing a characterization curve, the system converts electrical parameter changes into accurate temperature measurements that reflect the thermal environment of heat-producing devices
2Reliability
If discrete temperature sensors are positioned near heat-producing devices, then temperature monitoring capability is achieved, but measurement accuracy worsens due to thermal coupling and localized hot spot readings
Solution Approach 1:
The dielectric material between power and ground planes serves as an intrinsic temperature sensor that naturally reflects the thermal state of adjacent heat-producing devices. This eliminates the need for separate sensors that could be thermally coupled to hot spots, providing reliable temperature monitoring that accurately represents the actual operating conditions
Solution Approach 2:
The PCB dielectric material performs multiple functions: electrical insulation between power and ground planes, mechanical support for copper traces, and temperature sensing through its temperature-dependent leakage current. This multi-functionality provides reliable temperature monitoring without adding separate sensing components that could introduce measurement errors
3Measurement precision
If characterized dielectric with temperature-dependent leakage is used, then accurate temperature sensing is achieved, but device complexity increases due to leakage measurement circuit requirements
Solution Approach 1:
The patent measures temperature by detecting changes in electrical leakage current through the dielectric material. The leakage measurement circuit monitors this parameter change and converts it into temperature information, providing accurate temperature sensing while using relatively simple circuitry that can be integrated into existing PCB design
Solution Approach 2:
The dielectric material acts as an intermediary that translates temperature information into electrical leakage current signals. This intermediary function allows temperature measurement without direct thermal contact with heat-producing devices, using electrical measurement techniques that are simpler and more integrated than discrete sensor approaches
4Ease of manufacture
If existing PCB dielectric materials are used for temperature monitoring, then ease of manufacture is improved, but temperature monitoring capability is lost due to lack of characterized leakage properties
Solution Approach 1:
The patent performs preliminary characterization of standard PCB dielectric materials to establish their temperature-dependent leakage current properties. By pre-characterizing commonly used dielectric materials and storing reference data, the system enables temperature monitoring using existing PCB materials without requiring special manufacturing processes or exotic materials
Solution Approach 2:
The invention makes standard PCB dielectric materials serve the additional function of temperature sensing. By characterizing the leakage properties of conventional dielectric materials and using them in temperature monitoring applications, the system achieves accurate temperature sensing while maintaining compatibility with existing PCB manufacturing processes and materials
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
Provides accurate, broad temperature monitoring without discrete sensors, enabling timely responses to prevent hardware damage and maintain data integrity by using existing PCB design methodologies and materials, compatible with various electronic systems including computers and servers.
Implementation Method 1
a characterized dielectric within the PCB or flexible circuit that acts as a temperature-dependent resistor
Data Source
AI summary
An electronic system can be used to monitor temperature. The electronic system can include a characterized dielectric located adjacent to a plurality of heat-producing electronic devices. The electronic system can also include a leakage measurement circuit that is electrically connected to the characterized dielectric. The leakage measurement circuit can be configured to measure current leakage through the characterized dielectric. The leakage measurement circuit can also be configured to convert a leakage current measurement into a corresponding output voltage. A response device, electrically connected to the leakage measurement circuit can be configured to, in response to the output voltage exceeding a voltage threshold corresponding to a known temperature, initiate a response action.