Charging Control Device Abnormal Current Detection
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Solution Overview
Problem
Conventional charging control devices and units lack the necessary reliability to effectively detect and prevent abnormalities such as overcharge and temperature-related issues during constant voltage charging, leading to potential internal short circuits and reduced battery safety.
Innovation Solution
A charging control device equipped with a current detector, abnormal current determination circuit, and charging stop circuit that monitors charging current and temperature, using moving average methods to detect anomalies and stop charging when predetermined conditions are met, such as increased current or elevated temperatures, to prevent overcharge and internal short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional charging control devices are used, then charging operations can be performed, but reliability is insufficient to detect and prevent abnormalities during constant voltage charging
Solution Approach 1:
The patent applies preliminary action by calculating moving averages of charging current values before abnormal conditions occur. The control device continuously computes moving averages over predetermined time periods and compares current values against these pre-established baselines, enabling early detection of abnormal current increases before they lead to dangerous overheating or battery damage.
Solution Approach 2:
The patent implements feedback by continuously monitoring charging current, comparing real-time values against moving average baselines, and automatically stopping charging when abnormal increases are detected. This closed-loop feedback mechanism ensures that the system responds dynamically to changing conditions and prevents abnormal states from developing into safety hazards.
2Measurement precision
If charging current is monitored to detect abnormalities, then charging safety improves, but detection precision is insufficient without moving average methods
Solution Approach 1:
The patent establishes moving average values as preliminary reference baselines before abnormal conditions occur. By continuously calculating moving averages over predetermined time periods and storing these as baseline data, the system creates a dynamic reference that adapts to normal charging variations, enabling more precise detection of true abnormalities.
Solution Approach 2:
The patent transforms the detection approach by changing from absolute threshold comparison to relative deviation detection. Instead of checking if current exceeds a fixed value, the system calculates the difference between current values and their moving averages, detecting abnormalities based on significant deviations from the dynamic baseline rather than static thresholds.
3Reliability
If charging stops when abnormal conditions are detected, then battery protection improves, but charging time increases due to premature stops
Solution Approach 1:
The patent changes the detection parameter from absolute current thresholds to relative current increase rates. By monitoring whether current values exceed their moving averages by significant margins rather than comparing against fixed thresholds, the system distinguishes between normal charging variations and true abnormalities, reducing premature stops while maintaining battery protection.
Solution Approach 2:
The patent uses continuous feedback comparison between real-time current values and moving average baselines to determine when stopping is necessary. The system only stops charging when sustained abnormal increases are detected through multiple comparisons, rather than responding to transient fluctuations, thereby minimizing unnecessary charging interruptions.
Data Source
AI summary
Provided is a charging control device including a current detector, an abnormal current determination circuit, and a charging stop circuit. The current detector is configured to detect a charging current, the abnormal current determination circuit is configured to determine whether the charging current is attenuated and/or increased in a constant voltage charging region, and to determine whether a value of the charging current per unit time is increased, and the charging stop circuit is configured to stop a constant voltage charging when the value of the charging current per unit time is increased.