Charging Control Device for Dynamic Current Adjustment
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Solution Overview
Problem
Existing charging control devices face frequent interruptions in charging when the voltage of the charging power supply decreases, leading to unstable conditions, which deteriorates usability and efficiency.
Innovation Solution
A charging control device that includes a target value setting portion, a charging current adjusting portion, a supply voltage detecting portion, and a voltage monitoring portion to dynamically adjust the charging current based on the supply voltage, maintaining it at a level that prevents voltage drops and resumes charging when conditions stabilize.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the charging current is controlled by opening/closing a bypass circuit or changing resistance value based on voltage drop in the load limiting element, then the surrounding voltage can be maintained at a certain level, but the charging is stopped when voltage drops to the AC constant voltage determination threshold value, causing frequent interruptions
Solution Approach 1:
The patent changes the control parameter from voltage drop monitoring to supply voltage monitoring. By detecting the supply voltage directly and comparing it with a determination voltage threshold, the system can dynamically adjust the charging current target value based on actual supply conditions, preventing frequent interruptions while maintaining stable charging operation
Solution Approach 2:
The patent implements a feedback control mechanism where the supply voltage monitoring unit continuously detects supply voltage, and the charging current control unit adjusts the charging current target value based on the detected voltage level. This closed-loop feedback system enables automatic adaptation to supply voltage fluctuations, maintaining charging continuity and improving usability
2Reliability
If the charging current is reduced to maintain voltage level during unstable supply conditions, then voltage stability is improved, but the charging speed decreases
Solution Approach 1:
The patent employs dynamic control of the charging current target value based on real-time supply voltage conditions. When supply voltage is stable, the system operates at maximum charging current for high speed. When supply voltage drops below the determination voltage, the system dynamically reduces the target current to maintain voltage stability, then resumes higher current when voltage recovers. This dynamic adjustment optimizes both voltage stability and charging speed throughout the charging process
Data Source
AI summary
A charging control device includes a charging current control unit which sets a target value (Isp) of a charging current from an external power supply to a high-voltage battery, a charging current adjusting circuit which adjusts the charging current to the Isp, a supply voltage sensor which detects a supply voltage from the external power supply to the high-voltage battery, and a supply voltage monitoring unit which detects or predicts presence or absence of a decrease in the supply voltage from a predetermined normal charging voltage using an output of the supply voltage sensor, where when the decrease is not detected or predicted, the Isp is set to a predetermined normal target value, and when the decrease is detected or predicted, the Isp is changed to be equal to or lower than the normal target value and maintained at a value at which the supply voltage reaches a determination voltage.