Battery Field Device Power Switching for Longer Service Life
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Solution Overview
Problem
Battery-operated field devices, such as level measurement and display devices, face challenges in energy efficiency and maintenance due to continuous operation, leading to reduced battery life and increased maintenance needs.
Innovation Solution
A system architecture that includes a controllable switch to selectively power down non-essential components, such as measurement and display front ends, using a semiconductor switch like a MOSFET, and a time management unit for synchronization with a global time source, reducing overall energy consumption and extending battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the field device operates continuously to maintain functionality, then the device remains ready for measurement and display, but the energy consumption increases and battery life decreases
Solution Approach 1:
The field device implements periodic operation by switching between active and sleep modes. The control unit activates measurement and display components only when needed, then enters a low-power state. This periodic activation pattern reduces overall energy consumption while maintaining the ability to perform measurements and displays when required, directly resolving the contradiction between continuous readiness and energy conservation.
2Object-affected harmful factors
If the field device is encapsulated for corrosion protection, then the device achieves better protection against environmental factors, but battery replacement becomes more complex
Solution Approach 1:
The field device is divided into separable modules: an encapsulated hermetic unit containing the measurement components and a separate battery compartment. This segmentation allows the battery to be replaced independently without compromising the corrosion protection of the main device body. The hermetic seal remains intact while enabling easy battery access and replacement, resolving the contradiction between protection and maintainability.
3Productivity
If the measurement and display components are continuously powered, then the device can immediately perform measurements and display data, but the battery life is significantly reduced
Solution Approach 1:
The power supply state of the field device is made dynamic rather than static. The control unit continuously adjusts the power state of measurement and display components based on operational needs. When measurements or displays are required, components are activated; otherwise, they enter low-power mode. This dynamic power management extends battery life while maintaining productivity when needed, resolving the contradiction between continuous readiness and battery duration.
Data Source
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AI summary
The invention relates to battery-operated field devices, in particular field devices for level measurement, limit level determination, detection of the topology of a material surface, or display of the measured values of these devices. A battery-operated field device (100) comprises an energy storage device (200), a control unit (300) connected to the energy storage device (200) via a first line (205), and a load (400) connected to the energy storage device (200) via a controllable switch (250). The control unit (300) is configured to switch the controllable switch (250) on and off.