Voltage Display Control for Power Source Error Reduction
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Solution Overview
Problem
Existing display devices for electronic devices with multiple power sources, such as digital cameras, introduce AD conversion errors, leading to incorrect impressions of power source usage when the actual voltage does not decrease, causing unnecessary concern about the sub-power source's usage when the main power source is in use.
Innovation Solution
Implementing a control mechanism that updates the displayed voltage of the main power source immediately if the change is greater than a predetermined threshold, while only updating the sub-power source voltage if the change is equal to or greater than the threshold, to prevent false indications of power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the displayed voltage of the sub-power source is updated whenever the detected voltage changes, then the display reflects real-time voltage changes, but AD conversion errors cause false indications of power usage
Solution Approach 1:
The patent introduces a threshold parameter for voltage change detection. The control unit compares the absolute difference between newly detected voltage and currently displayed voltage against this threshold. Only when the difference exceeds the threshold does the sub-power source voltage display update, filtering out AD conversion errors that cause minor fluctuations below the threshold level.
2Speed
If the displayed voltage of the main power source is updated immediately with new detected voltages, then the display shows current voltage status, but frequent updates may show minor fluctuations
Solution Approach 1:
The patent applies different update strategies to different power sources based on their roles. The main power source voltage display updates immediately without threshold filtering to show real-time status, while the sub-power source voltage display uses threshold-based filtering for stability. This localized differentiation resolves the contradiction between update speed and stability.
3Reliability
If a threshold is applied to sub-power source voltage updates, then false indications from AD conversion errors are reduced, but real voltage changes below the threshold may not be displayed
Solution Approach 1:
The patent applies the threshold filter selectively only to the sub-power source voltage display, not to the main power source. This partial application of the filtering action maintains reliability for the sub-power source while preserving full precision for the main power source, balancing the trade-off between reliability and measurement precision.
Data Source
AI summary
An electronic device includes a detection unit that detects voltages of main and sub-power sources and a control unit that controls a display of the voltage of the main power source and a display of the voltage of the sub-power source on a display unit such that the displayed voltage of the main power source is updated to a newly-detected voltage even if a change between the new and displayed voltages is smaller than a predetermined threshold, and that the displayed voltage of the sub-power source is not updated to a newly-detected voltage if a change between the new and displayed voltages is smaller than the predetermined threshold, but is updated to the newly-detected voltage if the change between the new and displayed voltages is equal to or greater than the predetermined threshold.