Electronic Timepiece Time Correction Logic for Power Optimization
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Solution Overview
Problem
Electronic timepieces in always connected mode experience frequent link losses due to poor communication environments, leading to repeated disconnections and unnecessary time corrections, which increase power consumption and may result in incorrect time information if not synchronized appropriately.
Innovation Solution
Implementing a processor-based determination mechanism in electronic timepieces to assess the need for time correction based on the elapsed time since the last correction, only updating the time information when a certain threshold is exceeded, thereby reducing unnecessary corrections and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If time correction is performed every time communication connection is established, then time accuracy is improved, but power consumption increases and unnecessary corrections occur
Solution Approach 1:
The patent applies preliminary action by checking the elapsed time since the last correction before performing a time correction. The processor determines whether correction is needed by comparing the current time with the last correction time, and only performs correction when the elapsed time exceeds a predetermined threshold. This prevents unnecessary corrections and reduces power consumption while maintaining time accuracy.
2Reliability
If communication connection is maintained in always connected mode, then time synchronization opportunity is improved, but link loss frequency increases due to poor communication environment
Solution Approach 1:
The patent applies dynamics by making the time correction operation conditional rather than fixed. The processor dynamically determines whether to perform correction based on the elapsed time since the last correction and communication connection status. This adaptive approach allows the system to maintain time synchronization reliability while avoiding unnecessary operations during unstable connection periods in always connected mode.
3Measurement precision
If frequent time corrections are performed during link losses, then time accuracy is maintained, but battery life decreases
Solution Approach 1:
The patent applies preliminary action by checking the elapsed time since the last correction before performing a time correction. The processor determines whether correction is needed by comparing the current time with the last correction time, and only performs correction when the elapsed time exceeds a predetermined threshold. This prevents unnecessary corrections during link losses and reduces power consumption, thereby extending battery life while maintaining time accuracy.
Data Source
AI summary
Time is appropriately corrected without needlessly consuming power. In step S101 and step S102, a CPU of an electronic timepiece determines whether to correct a time measured by a timekeeping circuit. Then, when a determination is made to correct the time measured by the timekeeping circuit, in step S111 and step S112, the time measured by the timekeeping circuit is corrected on the basis of time information held by a wireless device.