Power Supply Circuit for Adaptive Full-Charge Detection
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Solution Overview
Problem
Existing battery charging methods fail to accurately determine full charge capacity when using low-rated power adapters, leading to reduced charge capacity due to reliance on fixed taper voltages that do not account for individual circuit resistance variations, resulting in insufficient charging even when voltage and current conditions are met.
Innovation Solution
A power supply circuit that dynamically adjusts detection voltages based on measured circuit resistance and actual charging conditions, switching to a second detection voltage when necessary to ensure accurate full charge determination, even during system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed taper voltage is used for full charge determination, then the charging control is simple, but the battery charge capacity becomes insufficient when circuit resistance varies
Solution Approach 1:
The patent applies dynamics by switching from a fixed taper voltage to a dynamic detection voltage that adapts to individual circuit resistance values. The detection voltage is calculated based on measured circuit resistance, allowing the charging system to adjust the full charge determination threshold according to actual circuit conditions, thereby resolving the contradiction between control simplicity and charging accuracy.
Solution Approach 2:
The patent changes the parameter of detection voltage from a fixed value to a variable value determined by circuit resistance measurements. By calculating the detection voltage as (charging voltage - (circuit resistance × detection current)), the system adapts the voltage threshold to match actual circuit characteristics, ensuring accurate full charge detection while maintaining reasonable control complexity.
2Weight of moving object
If a low-rated power adapter is used, then the device portability is improved, but the battery charging power becomes insufficient
Solution Approach 1:
The patent implements feedback by measuring the actual circuit resistance during charging and using this information to adjust the detection voltage dynamically. This feedback mechanism allows the system to maximize battery charging efficiency by accurately determining full charge conditions, thereby optimizing the limited charging power available from low-rated adapters and ensuring complete charging despite power constraints.
Solution Approach 2:
The patent changes the detection voltage parameter based on measured circuit resistance to optimize charging efficiency. By adapting the detection voltage to actual circuit conditions, the system extracts maximum charging capacity from limited adapter power, resolving the contradiction between portability and charging power sufficiency.
3Reliability
If the detection voltage is set lower to account for circuit resistance, then the full charge determination becomes safer, but the battery is undercharged
Solution Approach 1:
The patent dynamically adjusts the detection voltage parameter based on measured circuit resistance values. Instead of using a fixed conservative voltage threshold, the system calculates an appropriate detection voltage that accounts for actual circuit losses, thereby achieving both reliable full charge determination and complete battery charging capacity.
Solution Approach 2:
The system performs self-characterization by measuring its own circuit resistance and using this information to optimize the detection voltage. This self-service approach allows the charging system to adapt to its specific hardware characteristics, ensuring both safety and complete charging without manual intervention or overly conservative thresholds.
Data Source
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AI summary
The present application is to finish charging more accurately in the fully charged state even when electric power is consumed in a system. A power supply circuit supplies, to the system, system power required for the system out of DC power supplied from a power supply, and charges a battery with charging power as the remaining power, and when a cell voltage of the battery is a predetermined detection voltage or more and a charging current of the charging power becomes a predetermined detection current or less, the power supply circuit determines that the battery charged state is fully charged, estimates, as a second detection voltage, the cell voltage at the time when determining that the charged state is fully charged based on the cell voltage obtained in a specific charging state to the battery, and updates the predetermined detection voltage from a predetermined first detection voltage to the second detection voltage.