Dynamic Charging Control for High-Power Fast-Charging Overvoltage
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Solution Overview
Problem
High-power fast charging technologies face challenges in accurately controlling charging voltage during rapid switching between stages, leading to ultra-high voltages due to fixed polling time and step adjustments, which fail to meet the requirement of precise voltage control.
Innovation Solution
A charging control method that determines a current rate of change threshold, polling duration, and current adjustment step for each charging stage, ensuring the ratio of the adjustment step to the polling duration exceeds the threshold, allowing for accurate current adjustment and preventing overvoltage by detecting and adjusting the charging current based on these parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed polling time and fixed step adjustment are used for charging stage switching, then the control method is simple, but the switching speed is slow and voltage control precision is insufficient
Solution Approach 1:
The patent applies dynamics by making the polling duration and current adjustment step dynamic rather than fixed. The polling duration is adjusted based on the charging stage and current rate of change, allowing the system to adapt to different charging conditions. This enables faster response during critical switching periods while maintaining simplicity in implementation through predefined adjustment rules for different stages.
2Ease of operation
If fixed polling time is used for charging monitoring, then the monitoring process is simple, but the switching speed cannot keep up with rapid charging stage transitions
Solution Approach 1:
The patent segments the charging process into multiple stages, each with its own polling duration and adjustment parameters. By dividing the charging process into distinct phases (fast charging stage, constant voltage stage, etc.), the system can apply different polling frequencies to each stage, enabling faster response during critical transitions while keeping the overall system manageable through standardized stage definitions.
3Power
If charge pump is used for high-power fast charging, then charging power is high, but the charge pump cannot control charging output voltage and current
Solution Approach 1:
The patent introduces an intermediary control layer (the control method) between the charge pump and the battery. This intermediary layer monitors charging parameters and dynamically adjusts the charge pump's operation through controlled current adjustments. The charge pump provides high power capability while the control method adds the necessary voltage and current control, combining the advantages of both high power delivery and precise control.
Data Source
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AI summary
A charging control method, a charging control device and a storage medium are provided. The charging control method is applied to a battery charging process including multiple charging stages and includes that: for each charging stage among the multiple charging stages, a current rate of change threshold corresponding to a present charging stage is determined; a polling duration and current adjustment step corresponding to the present charging stage are determined, a ratio of the current adjustment step to the polling duration being greater than the current rate of change threshold; and in the present charging stage, a charging current value is detected according to the polling duration, and if the charging current value is greater than a specified current threshold, a current is adjusted according to the current adjustment step.