Watchdog Timer for Voltage Detector Visual Warning
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Solution Overview
Problem
Microcontrollers in voltage detectors may malfunction, leading to inaccurate voltage readings, potentially exposing users to extreme risk as the displayed voltage values do not reflect the actual detected voltage, and existing systems lack effective mechanisms to warn users of such malfunctions.
Innovation Solution
A dedicated external watchdog timer monitors the microcontroller's operation and triggers a visual warning mechanism via the display to alert users of potential hazards, even if the microcontroller malfunctions, ensuring user safety by indicating a hazardous high voltage condition, regardless of the malfunction's severity, and providing an independent malfunction detection means.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the microcontroller is used to control the display refreshing, then the voltage values can be displayed in real time, but the displayed voltage may not accurately represent the actual detected voltage when the microcontroller malfunctions
Solution Approach 1:
An intermediary watchdog timer is introduced between the microcontroller and the display system. The watchdog timer independently monitors whether the microcontroller is functioning properly by checking for regular service signals. When the microcontroller malfunctions, the watchdog timer detects this and triggers a visual warning on the display, ensuring that inaccurate voltage readings are flagged to users.
Solution Approach 2:
A feedback mechanism is implemented where the watchdog timer continuously monitors the microcontroller's operation and provides feedback through the display system. When the microcontroller fails to service the watchdog timer regularly, the system receives feedback indicating a malfunction, and the display shows a warning signal to alert users that the voltage readings may be inaccurate.
2Reliability
If a watchdog timer is used to monitor microcontroller operation, then system reliability is improved, but the system complexity increases
Solution Approach 1:
The watchdog timer is designed with multi-functionality to reduce overall system complexity. It not only monitors the microcontroller operation but also directly controls the display warning function. This consolidation of monitoring and warning functions into a single watchdog timer module avoids the need for separate complex monitoring and alerting systems.
Solution Approach 2:
The watchdog timer operates as a self-service monitoring mechanism. It automatically services itself by being periodically activated by the microcontroller during normal operation. When the microcontroller fails to service the watchdog timer, the watchdog timer autonomously detects the malfunction and triggers the warning display without requiring additional complex control logic.
Data Source
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AI summary
The present invention relates to a watchdog timer (102) dedicated to the display controller (103) of a voltage detector (100) wherein the watchdog (102) determines a malfunction in the microcontroller (101) and triggers a visual warning to be displayed via the display controller (103). This prevents inaccurate voltage information from being displayed in the case of a microcontroller (101) malfunction and thereby the user from being exposed to the risk of extreme injury through, for example, a high-voltage shock.