Voltage Supervisor Shutdown Path for Fail-Safe Signal Outputs
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Solution Overview
Problem
Existing safety devices lack comprehensive testing for overvoltages and undervoltages, which can lead to malfunctions and unsafe conditions, despite using redundant computer structures for functional testing.
Innovation Solution
Incorporating a monitoring circuit with a voltage supervisor module that detects overvoltages and undervoltages, disconnecting signal outputs from the power supply to ensure safe operation, and using a control unit to manage multiple monitoring circuits with a shared switch-off path, reducing circuit complexity and enabling complete functional testing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage monitoring is implemented using conventional comparators, then overvoltage and undervoltage detection is achieved, but the circuit complexity increases due to required external circuitry
Solution Approach 1:
The patent merges multiple functions (voltage comparison, reference voltage generation, hysteresis control) into a single integrated voltage supervisor module. This consolidation eliminates the need for external reference voltage circuits and hysteresis networks that would be required with conventional comparators, significantly reducing circuit complexity while maintaining detection reliability.
Solution Approach 2:
The voltage supervisor module serves multiple functions simultaneously: it acts as a voltage comparator, provides internal reference voltages, implements hysteresis for noise immunity, and generates shutdown signals. This multi-functionality eliminates the need for separate external circuits for each function, simplifying the overall monitoring circuit design.
Data Source
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Figure 3a~3b
AI summary
The invention relates to a safety device (1) with an arrangement of signal outputs (4) via which output signals can be sent. A power supply is associated with the signal outputs (4). At least one monitoring circuit (5) with a voltage supervisor module (6) is provided, by means of which overvoltage or undervoltage monitoring can be performed. If an overvoltage or undervoltage is detected in the monitoring circuit (5), the signal outputs (4) are disconnected from the power supply by means of a shutdown path.