Wireless Earphone Charging Circuit Timing for Battery Level Correction
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Solution Overview
Problem
After firmware upgrades, the battery level measurement of wireless earphones is inaccurate due to the voltameter being updated with a charging voltage instead of the actual power supply voltage.
Innovation Solution
A method is implemented where the charging device disconnects its charging circuit for a target period after firmware upgrade, allowing the wireless earphones to discharge and ensuring the voltameter measures the actual power supply voltage post-discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the charging device and wireless earphones are upgraded correspondingly through firmware upgrade, then the system compatibility and functionality are improved, but the battery level measurement accuracy deteriorates due to voltameter reading charging voltage instead of actual power supply voltage
Solution Approach 1:
The charging device disconnects the charging circuit before the wireless earphones complete their firmware upgrade and restart. This preliminary disconnection ensures that when the voltameter reads the voltage after restart, it reads the actual power supply voltage rather than charging voltage, thus preventing the battery level measurement error from occurring in the first place
Solution Approach 2:
The charging device actively prevents the harmful effect of voltage misreading by disconnecting the charging circuit in advance. This anti-action counteracts the potential error where the voltameter would otherwise read charging voltage instead of actual power supply voltage, ensuring measurement accuracy without requiring post-upgrade correction
2Duration of action of stationary object
If the charging circuit remains connected during firmware upgrade, then the wireless earphones maintain power supply, but the voltameter reads charging voltage instead of actual power supply voltage causing measurement error
Solution Approach 1:
The charging device disconnects the charging circuit at a precisely calculated time before the wireless earphones restart after firmware upgrade. This timing ensures that the voltameter reads the actual power supply voltage (from the battery) rather than charging voltage, while the wireless earphones still have sufficient power to complete the restart process
Solution Approach 2:
The charging circuit undergoes periodic connection and disconnection during the firmware upgrade process. It is connected during the initial phase to provide power, then disconnected before restart to ensure accurate voltage reading, and can be reconnected afterward. This periodic action resolves the contradiction between maintaining power supply and ensuring measurement accuracy
Data Source
AI summary
Disclosed is a method for correcting battery level of wireless earphones. The wireless earphones comprise a voltameter, the voltameter determines the battery level of the wireless earphones according to a power supply voltage of the wireless earphones. The method for correcting battery level of wireless earphones comprises: when a charging device is started for the first time after firmware upgrade is completed, obtaining an interval period between a starting time point of the charging device and a predicted starting time point of the wireless earphones; determining a target period according to the interval period, wherein the target period is greater than or equal to the interval period; and controlling a charging circuit of the charging device to be disconnected for the target period, to enable the wireless earphones to be discharged for the target period.