Dynamic Battery Voltage Threshold Adjustment via Internal Resistance
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Solution Overview
Problem
Conventional battery charging schemes switch from constant current to constant voltage mode too early due to internal voltage drops, leading to longer charging times and inadequate protection of the battery.
Innovation Solution
A method and apparatus that dynamically measure the internal resistance of a battery and adjust the voltage threshold based on this measurement and the current flowing through it, using a sensor circuit and controller circuit to optimize charging and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional charging scheme with fixed voltage threshold is used, then the battery protection scheme is simple to implement, but the charging time is extended and the protection timing is delayed due to internal voltage drop
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed voltage threshold to a dynamic voltage threshold that adapts to changing battery conditions. The voltage threshold is adjusted in real-time based on measured internal resistance and charging current, allowing the charging scheme to optimize charging time while maintaining protection accuracy throughout the charging process
Solution Approach 2:
The patent changes the voltage threshold parameter from a static value to a dynamic value that varies with battery state. By measuring internal resistance and charging current, the system calculates and adjusts the voltage threshold parameter to compensate for internal voltage drop, thereby reducing charging time without increasing implementation complexity
2Device complexity
If a conventional charging scheme with fixed voltage threshold is used, then the implementation is simple, but the battery protection timing is delayed and insufficient
Solution Approach 1:
The patent implements feedback by continuously measuring the battery's internal resistance and charging current, then using this information to adjust the voltage threshold. This closed-loop feedback mechanism ensures accurate battery protection timing by compensating for internal voltage drop in real-time, improving protection reliability without significantly increasing system complexity
Solution Approach 2:
The patent replaces the simple mechanical comparison of fixed voltage threshold with a more sophisticated electronic measurement and calculation system. By substituting the fixed threshold mechanism with dynamic measurement of internal resistance and current-based threshold adjustment, the system achieves accurate protection timing
3Productivity
If higher charging current is used to reduce charging time, then the charging speed increases, but the internal voltage drop becomes more significant and affects protection accuracy
Solution Approach 1:
The patent changes the voltage threshold parameter dynamically based on charging current magnitude. When higher charging current is applied to increase charging speed, the system measures the increased internal resistance and adjusts the voltage threshold accordingly, maintaining measurement precision despite the larger internal voltage drop
Solution Approach 2:
The patent applies dynamics by making the voltage threshold adaptive to charging current levels. The system continuously monitors charging current and adjusts the voltage threshold in real-time, allowing high charging speeds to be maintained while preserving protection accuracy through dynamic compensation for current-dependent internal voltage drop
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the overall charging time and ensures precise protection of the battery by dynamically adjusting voltage thresholds, avoiding malfunctions caused by internal voltage drops.
Implementation Method 1
measuring an internal resistance of the battery; measuring an external voltage level of the battery; measuring a charging current to be provided to the battery; estimating the internal resistance of the battery according to the first result, the second result, and the charging current
Data Source
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AI summary
A method for adjusting a voltage threshold for a battery being connected to a portable device includes: dynamically measuring an internal resistance of the battery; and dynamically adjusting the voltage threshold according to the internal resistance of the battery and a current flowing through the battery.