Dual-Battery FET Control for Voltage Imbalance Protection
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Solution Overview
Problem
Dual battery systems face deterioration due to voltage differences during charging and discharging, leading to rapid degradation of high-voltage batteries when balancing voltage with low-voltage batteries and external devices.
Innovation Solution
A system and method that control the charging/discharging process between dual batteries by using parallel paths and communication units to manage voltage differences, switching charging FETs on or off based on voltage measurements and external control signals to prevent overdischarging and maintain battery health.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the charging FET is kept in On state to enable immediate charging/discharging operation, then the response speed is improved, but voltage imbalance between batteries causes rapid deterioration of high-voltage batteries
Solution Approach 1:
The charging FET's on/off state is dynamically adjusted based on voltage difference detection between batteries. When voltage imbalance exceeds a threshold, the charging FET is switched off to prevent overdischarge of high-voltage batteries. This dynamic control resolves the contradiction by adapting the system state to real-time conditions rather than maintaining a fixed On state.
Solution Approach 2:
A feedback mechanism is implemented where voltage levels of both batteries are continuously monitored. When a voltage difference is detected, the system responds by controlling the charging FET state. This feedback loop enables the system to automatically prevent battery deterioration while maintaining operational readiness, resolving the contradiction between speed and reliability.
2Reliability
If multiple FETs are used to control charging/discharging paths, then battery protection is improved, but device complexity increases
Solution Approach 1:
The patent extracts and isolates the critical control function to a specific charging FET that is selectively switched based on voltage conditions. Rather than complex multi-FET control schemes, the invention focuses on controlling the charging FET's on/off state to achieve battery protection. This extraction of the essential control function reduces complexity while maintaining protection effectiveness.
Data Source
AI summary
The present invention relates to a system and method for controlling inter-battery charging/discharging of a dual battery, and relates to a system and method for controlling charging/discharging between batteries to prevent a problem in which a specific battery is deteriorated due to charging/discharging between batteries due to a voltage difference when the voltage difference between the batteries of the dual batteries installed in the external system is within the appropriate range.