Wireless Discrete I/O Power Switching for Battery-Safe Field Devices
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Solution Overview
Problem
Wireless field devices face reduced battery life due to increased functionality and faster update rates, and simultaneous use of internal and external power sources can damage internal circuitry, posing safety risks.
Innovation Solution
A wireless field device with a mechanical slider mechanism that allows exclusive selection of either battery or external power, preventing both from being connected simultaneously, and includes protection diodes for intrinsic safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless field device uses battery power for operation, then portability and ease of installation are improved, but battery life is reduced due to increased functionality and faster update rates
Solution Approach 1:
The power supply configuration is made dynamic and adaptable. The device can switch between battery-powered portable mode and externally-powered stationary mode based on application requirements. This allows the system to optimize between ease of installation (battery mode) and sustained performance duration (external power mode) rather than being constrained to a single power source.
2Productivity
If wireless field device supports faster update rates and higher power requirements, then device performance and functionality are improved, but battery life is reduced
Solution Approach 1:
The device incorporates universal power compatibility by accepting both battery power and external power sources. This multi-functionality in power supply allows the device to maintain high performance characteristics (fast update rates, high power requirements) when connected to external power, while retaining the ability to operate in battery mode when portability is prioritized over sustained performance.
Solution Approach 2:
The power supply parameters are made changeable. The device can transition between different power sources and operating modes based on performance requirements. When high update rates and power consumption are needed, the system switches to external power mode, effectively changing the power supply parameter from limited battery capacity to unlimited external power supply.
3Adaptability or versatility
If device allows simultaneous connection of internal and external power sources, then power flexibility is improved, but internal circuitry can be damaged causing safety risks
Solution Approach 1:
A power management circuit acts as an intermediary between the battery and external power sources. This intermediary component monitors the connection status of both power sources and actively prevents simultaneous operation, thereby maintaining circuit safety while preserving power flexibility. The power management circuit serves as a mediator that enables versatile power options without compromising reliability.
4Adaptability or versatility
If device provides external power supply input and battery power supply input, then power source options are improved, but device complexity increases
Solution Approach 1:
A dedicated power management circuit serves as an intermediary that handles the complexity of dual power source integration. This specialized circuit automatically manages power source selection, connection monitoring, and safety protection, thereby providing versatile power options without proportionally increasing overall device complexity. The power management circuit consolidates multiple control functions into a single integrated component.
Data Source
AI summary
A wireless field device for use in an industrial process includes input/output terminals to couple to a process interface element and a discrete input/output channel to receive a discrete input signal from the process interface element when configured as a discrete input channel, the discrete input/output channel further configured to provide a discrete output to the process interface element when configured as discrete output channel. Wireless communication circuitry transmits and receives information. A controller transmits information through the communication circuitry based upon a sensed process variable, provides a discrete output signal when the discrete input/output channel is configured as a discrete output channel and receives a discrete input signal when configured as a discrete input channel. An external power supply input couples to an external power supply and a battery power supply input couples a battery.