IED Display Power Management via Door Switch Trigger
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Solution Overview
Problem
Microprocessor-based protection and control relays used in outdoor power transmission and distribution networks face display module failures due to extreme temperature fluctuations, leading to high repair costs, as conventional LCD displays are continuously powered and not designed for non-controlled outdoor environments.
Innovation Solution
Incorporating a timer circuit and a switch mechanism within an intelligent electronic device (IED) cabinet that powers down or reduces power to the display module when not in use, with the display module being activated upon cabinet door opening, allowing for extended lifespan and energy savings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LCD display is continuously powered, then the display is always ready for use, but the display module fails due to extreme temperature fluctuations in outdoor environments
Solution Approach 1:
The display module alternates between powered-off state and powered-on state based on usage conditions. A timer circuit monitors inactivity periods and automatically powers down the display after a predetermined time interval, while a door switch triggers immediate power-up when the cabinet door is opened, creating a periodic on-off cycle that extends display life in outdoor environments.
2Reliability
If higher grade components are used, then the display can tolerate extreme temperatures, but the cost of the LCD display module increases
Solution Approach 1:
The patent changes the operational parameters of the display module by controlling its power state rather than changing the physical or chemical properties of the display components themselves. By adjusting the power supply parameter (on/off cycles), standard-grade components can withstand outdoor temperature extremes without requiring expensive high-temperature-rated parts.
3Duration of action of stationary object
If the display is powered off when not in use, then the lifespan of the display is extended, but the display cannot be immediately accessed when needed
Solution Approach 1:
The door switch is positioned to detect door opening before the user actually needs to interact with the display. This preliminary detection triggers the power-up sequence in advance, ensuring the display is fully operational by the time the user reaches for it, thus eliminating any perceived waiting time while maintaining the energy-saving off-state during periods of non-use.
Data Source
AI summary
An assembly includes a cabinet having an interior and a door to gain access to the interior. An intelligent electronic device (IED) is within the interior of the cabinet and includes inputs providing electrical connections to the IED, pushbuttons to provide user input to the IED, a display module including a display, a component, and a timer circuit. The timer circuit powers the component OFF or places it in a reduced power state when not in use after a certain amount of time. A switch is associated with the door and is electrically connected to at least one of the inputs so that when the display module is powered OFF or in the reduced power state and when the door is opened, the switch causes a signal to be sent to the timer circuit to cause the timer circuit to power the component fully ON.