Touch Screen Frequency Adaptation for Charger Interference
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Solution Overview
Problem
Current frequency adaptive algorithms are insufficient in eliminating interference from chargers, particularly quick chargers, which affect the performance of touch screens, even when normal chargers are used.
Innovation Solution
A method for determining the interference frequency based on the charging mode, allowing the touch screen to operate at a working frequency different from the interference frequency, thereby reducing interference and improving control experience. This involves identifying the charging mode as either quick or normal, determining the interference frequency, and selecting an appropriate working frequency to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frequency adaptive algorithm is used to detect and avoid interference frequency, then the touch screen can operate at a different frequency, but the algorithm cannot completely eliminate interference from quick chargers due to large charging current
Solution Approach 1:
The patent implements dynamic switching between two different working frequencies (first and second working frequencies) based on the detected interference frequency. The system continuously monitors the interference frequency and dynamically adjusts the touch screen's working frequency to avoid the interference, rather than using a static frequency adaptation approach. This dynamic frequency switching mechanism enables the touch screen to effectively eliminate interference from both normal and quick chargers.
2Productivity
If the charging current is increased for quick charging, then charging speed is improved, but common-mode interference seriously affects touch screen performance
Solution Approach 1:
The patent changes the working frequency parameter of the touch screen based on the detected interference frequency. When interference is detected at a particular frequency, the system switches to an alternative working frequency that is different from the interference frequency. This parameter change approach allows the touch screen to maintain reliable operation during quick charging by operating at a frequency that avoids the common-mode interference generated by the high charging current.
Data Source
AI summary
Provided is a method for eliminating the interference of a charger to a touch screen and a mobile terminal. The method can include the follows. A charging mode is determined. The charging mode includes a normal charging mode and a quick charging mode, and the quick charging mode has a charging current that is higher than the charging current of the normal charging mode. An interference frequency is determined according to the charging mode. A working frequency of the touch screen is determined according to the interference frequency.