Switch Feedback Circuit for Fault-Resistant Input Detection
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Solution Overview
Problem
In digital electronic circuits, it is challenging to distinguish between a signal intentionally driven to the active state and a signal faulted to the active state due to short circuits, ground faults, or other anomalies, making it difficult to determine when a switch fault has occurred.
Innovation Solution
A switch assembly is configured with a logic circuit that compares input signals from a switch to output signals, generating a fault signal when the input does not match the output, thereby determining valid switch actuation and suppressing invalid switch outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a switch signal is monitored without feedback verification, then the system responds quickly to switch actuation, but the system cannot distinguish between valid actuation and fault conditions
Solution Approach 1:
The logic circuit sends a feedback signal to the switch and compares the returned signal with the original output to verify switch integrity. This feedback mechanism allows the system to detect faults while maintaining reliable operation, directly resolving the contradiction between reliability and complexity by introducing a manageable level of additional circuitry that provides substantial fault detection capability
2Measurement precision
If a logic circuit compares input and output signals to detect faults, then fault detection accuracy improves, but the response time increases due to additional processing
Solution Approach 1:
The logic circuit continuously monitors and compares signals in real-time, performing fault detection checks before they become critical issues. By continuously comparing the feedback signal with the original output signal, the system maintains high detection accuracy without significant time loss, as the comparison process is integrated into the normal operating cycle
Data Source
AI summary
A switch assembly configured to determine when input received from a switch is caused by proper actuation of the switch and should be accepted, or is caused instead by a fault in the switch or in the intervening circuitry and should be ignored and/or reported. The switch assembly optionally includes a logic circuit that is electrically connected to the switch. The logic circuit may provide power to the switch, for example, as a time varying signal, which may then be presented to the logic circuit as input when the switch is properly actuated. The logic circuit may then compare the input from the switch with the signal sent to the switch to determine if a fault is present, or if the switch is operating properly.