Flexible PCB Temperature Sensor Fault Detection
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Solution Overview
Problem
Personal electronic devices, especially wearable ones, face challenges in detecting and mitigating electrical faults due to space constraints, which can lead to user discomfort and device damage from excessive current flow and temperature increases.
Innovation Solution
Incorporating temperature sensors, such as negative temperature coefficient resistors, on flexible printed circuits to monitor temperature and a power management unit to provide warnings and initiate shutdowns when thresholds are exceeded, along with monitoring current or power draw to detect electrical faults and trigger shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature sensors and fault detection circuitry are added to detect electrical faults, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple functions into the existing power management unit (PMU). The PMU integrates temperature monitoring, current monitoring, and fault detection capabilities that already exist for battery management, eliminating the need for separate fault detection circuitry and reducing overall device complexity while improving reliability.
Solution Approach 2:
The power management unit is designed to perform multiple functions: battery charging, power regulation, temperature monitoring, and electrical fault detection. By making the PMU universal and multi-functional, the patent avoids adding dedicated fault detection hardware, thus improving reliability without increasing device complexity.
2Device complexity
If multiple monitoring functions are integrated into the power management unit, then device complexity is reduced, but measurement precision may be compromised
Solution Approach 1:
The power management unit leverages existing temperature sensors that were already present for battery thermal management. By reusing these sensors and their associated signal conditioning circuits for additional fault detection purposes, the system maintains measurement precision without adding complex new monitoring subsystems.
Solution Approach 2:
The PMU continuously monitors temperature and current parameters and uses feedback mechanisms to detect anomalies. The system compares real-time measurements against predefined thresholds and historical data, enabling precise fault detection through intelligent processing of sensor data rather than requiring additional high-precision hardware sensors.
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
Effectively detects and mitigates electrical faults by preventing further damage and user discomfort through timely shutdowns and logging events, while being compact enough to fit within the constraints of wearable devices.
Implementation Method 1
The temperature sensors can be negative temperature coefficient resistors
Data Source
AI summary
A personal electronic device can include a main printed circuit board having disposed thereon a processing unit, one or more auxiliary circuits coupled to the main printed circuit board by one or more corresponding flexible printed circuits and one or more temperature sensors disposed on one of the flexible printed circuits. A processing unit of the portable electronic device can be configured to monitor the one or more temperature sensors, provide a warning in response to a monitored temperature exceeding a first threshold, and to cause a shutdown of at least a portion of the personal electronic device in response to the monitored temperature exceeding a second threshold. The temperature sensors can be negative temperature coefficient resistors.