Electronic Identification Device Power Management via Sleep State
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Low-power office products, such as electronic tags and electronic table cards, face high power consumption due to continuous wireless communication, necessitating frequent charging or battery replacement, which limits their usage in intelligent IoT applications.
Innovation Solution
A display method for electronic identification devices using a bistable electronic ink screen that enters a low-power sleep state when not updating, minimizing power consumption by refreshing data through a serial peripheral interface bus and switching between DC-to-DC and Low Dropout Regulator power conversion modes based on device states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless communication is continuously performed in electronic identification devices, then communication functionality is improved, but power consumption increases
Solution Approach 1:
The electronic identification device performs wireless communication periodically rather than continuously. The device wakes up from sleep state at predetermined intervals to communicate with the controller, then returns to sleep state. This periodic communication pattern maintains communication functionality while dramatically reducing power consumption compared to continuous communication.
2Loss of information
If the electronic identification device remains in working state, then data display is updated, but power consumption increases
Solution Approach 1:
The device alternates between working state and sleep state in periodic cycles. During working state, data is received and displayed on the electronic ink screen. After display update is complete, the device transitions to sleep state to conserve power. This periodic state switching ensures data is kept current while minimizing energy consumption during static display periods.
Solution Approach 2:
The device changes its operational parameters by switching between two distinct states: working state with higher power consumption for data updates, and sleep state with minimal power consumption for data retention. The electronic ink screen's bistable nature allows the display to maintain information without power, enabling this parameter change strategy to be effective.
3Use of energy by moving object
If DC-to-DC power conversion is used in working state, then power efficiency is improved, but device complexity increases
Solution Approach 1:
The power conversion circuit dynamically switches between DC-to-DC conversion mode during working state and Low Dropout Regulator mode during sleep state. This dynamic adaptation allows the system to use the more efficient DC-to-DC converter when high power is needed, and the simpler LDO when low power is sufficient, optimizing the balance between efficiency and complexity based on real-time operational requirements.
Data Source
AI summary
A display method of an electronic identification device, a controller, an electronic identification device and a system are provided. The display method includes: controlling the electronic identification device to enter a working state from a sleep state, and obtaining to-be-displayed data; power consumption corresponding to the electronic identification device in the sleep state being lower than power consumption corresponding to the electronic identification device in the working state; and refreshing the to-be-displayed data to an electronic ink screen for display through a serial peripheral interface bus, and controlling the electronic identification device to enter the sleep state again after the refreshing is completed.