Electronic Lock Keypad Power Management via Periodic Scanning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electronic locks using full-power scan consume excessive power, leading to frequent battery replacements and inconvenience due to lack of power efficiency.
Innovation Solution
An electronic lock with a keypad module and processor module that switches between sleep and work modes, using a pulse wave detection signal to reduce power consumption by only activating the detection process when needed, and entering sleep mode when idle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If full-power scan is used to detect user operations on touch panel, then detection reliability is improved, but power consumption increases significantly
Solution Approach 1:
The processor module alternates between work mode and sleep mode periodically. In work mode, full-power scan is performed to detect user operations with high reliability. In sleep mode, the emission process is ceased to save power. This periodic switching resolves the contradiction by providing high detection reliability only when necessary while reducing power consumption during idle periods.
Solution Approach 2:
The system dynamically adjusts its operation state based on user input detection. The processor module transitions from sleep mode to work mode when activation signals are detected, and returns to sleep mode after a predetermined time period of no input. This dynamic state adjustment ensures high detection reliability during active periods while minimizing power consumption during inactive periods.
2Measurement precision
If full-power scan is continuously performed, then detection precision is maintained, but battery life decreases due to frequent replacements
Solution Approach 1:
The system performs full-power scan periodically in work mode rather than continuously. The sleep mode periods allow the battery to conserve energy, extending battery life. Detection precision is maintained during work mode when the emission process is active, while the periodic sleep periods prevent continuous power drainage.
Solution Approach 2:
The system maintains continuous monitoring capability through rapid switching between work and sleep modes. When user input is detected, the system immediately transitions to work mode to maintain detection precision. The continuous readiness to detect input is preserved while allowing battery recovery during sleep periods.
3Loss of energy
If frequent battery replacement is required, then power efficiency is poor, but user convenience deteriorates
Solution Approach 1:
By implementing periodic work and sleep modes, the system dramatically improves power efficiency, extending battery life and reducing the frequency of battery replacements. This directly enhances user convenience by eliminating the inconvenience of frequent battery changes while maintaining adequate detection capability during active periods.
Data Source
AI summary
An electronic lock includes an input apparatus. The input apparatus includes a keypad module and a processor module. The keypad module includes plural button devices arranged in plural rows and in plural columns. The processor module includes a signal-processing unit configured to, when operating in a work mode, repeatedly perform an emission process of inputting a detection signal to each column of button devices, and repeatedly perform a scan process to detect, for each row of button devices, the detection signal outputted from any row of button devices. The detection signal includes a pulse wave composed of plural pulses. The signal-processing unit is further configured to generate and output an input signal corresponding to one of the button devices when detecting the detection signal.