Continuously Powered Field Device Power Switching
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Solution Overview
Problem
Field devices in process control systems experience downtime due to power depletion, leading to operational disruptions, data loss, and inefficiencies, as they require manual replacement of power modules, causing network instability and prolonged downtime.
Innovation Solution
A continuously powered field device with a power source switching module that automatically switches between a primary and backup power source, ensuring continuous operation by coupling the backup power source when the primary source falls below a threshold voltage level, thereby minimizing downtime and maintaining network stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If battery-based power modules are used in field devices, then device placement flexibility is improved, but device downtime increases due to manual power module replacement
Solution Approach 1:
The system performs preliminary action by automatically detecting when the primary power source voltage drops below a threshold and proactively switching to the backup power source before complete depletion occurs. This prevents downtime by ensuring power continuity without waiting for manual intervention or complete battery exhaustion.
Solution Approach 2:
The system implements self-service through automatic power source switching capability that operates without human intervention. The power source switching module continuously monitors power source status and autonomously transitions between primary and backup power sources, eliminating the need for manual power module replacement and associated downtime.
2Reliability
If manual power module replacement is performed, then power source depletion is addressed, but network stability deteriorates during the replacement process
Solution Approach 1:
The system ensures continuity of useful action by maintaining uninterrupted power supply to the field device through automatic switching between power sources. The backup power source seamlessly takes over when the primary source is depleted, ensuring the device remains operational and connected to the network without interruption, thus maintaining network stability.
3Adaptability or versatility
If battery-based power modules are used, then device portability is improved, but operational continuity worsens due to power depletion
Solution Approach 1:
The system performs preliminary action by detecting power source voltage levels and switching to the backup power source before the primary battery is completely depleted. This proactive approach ensures operational continuity is maintained without interruption, extending the effective operational duration of the portable field device.
Solution Approach 2:
The system applies parameter changes by switching between different power source configurations (primary battery to backup power source) based on voltage level parameters. This allows the device to maintain portable operation while extending operational continuity through dynamic parameter-based power source selection.
Data Source
AI summary
A continuously powered field device for use in a process control system includes a field device housing, a primary power port disposed within or connected to the field device housing, and a power source switching module comprising a first power terminal, a second power terminal, and a third power terminal. The first power terminal is coupled to the primary power port, and the third power terminal is configured to deliver power applied to the third power terminal to at least a portion of the field device. The power source switching module is operable in a first state of operation to couple the first power terminal to the third power terminal, and the power source switching module is operable in a second state of operation to couple the second power terminal to the third power terminal.