Vehicle Auxiliary Low-Voltage Bus Balancing for Equal Power Sharing
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Solution Overview
Problem
Modern vehicles with multiple auxiliary low voltage buses often experience unequal load distribution, leading to battery cell/module imbalance and performance issues due to different voltage levels across these buses.
Innovation Solution
A method and system for balancing the voltage levels across multiple auxiliary low voltage buses using a controller, which adjusts the voltage based on voltage offsets, resistive load distribution, resistance ratios, constant current load distribution, and charging currents, ensuring equal power sharing and load balancing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple auxiliary low voltage buses operate at different voltage levels, then each bus can serve its specific electrical loads, but unequal load distribution occurs leading to battery cell/module imbalance
Solution Approach 1:
The controller actively regulates the voltage levels of multiple auxiliary low voltage buses to maintain them at equipotential states. By continuously monitoring voltage differences and adjusting power distribution, the system ensures all buses operate at balanced voltage levels, preventing battery cell/module imbalance while maintaining the ability to serve different electrical loads.
Solution Approach 2:
The system dynamically changes voltage parameters across different auxiliary buses based on real-time load conditions and battery state. The controller adjusts voltage levels and power distribution parameters to optimize both adaptability to different loads and maintain battery health, resolving the contradiction between voltage flexibility and battery balance.
2Device complexity
If a single battery serves multiple auxiliary low voltage buses, then system complexity is reduced, but load distribution becomes unequal causing performance issues
Solution Approach 1:
The controller acts as an intermediary between the single battery and multiple auxiliary low voltage buses. It intelligently distributes power to each bus based on real-time voltage levels, load requirements, and battery capacity, ensuring equal load distribution while maintaining system simplicity. This intermediary function resolves the contradiction by optimizing power flow without requiring multiple batteries or complex hardware architecture.
3Ease of manufacture
If voltage levels are allowed to differ across auxiliary buses, then each bus can be optimized for specific loads, but battery cell/module imbalance occurs
Solution Approach 1:
The system implements continuous feedback monitoring of voltage levels across all auxiliary low voltage buses and battery state. The controller uses this feedback to dynamically adjust power distribution, preventing voltage differences that would cause battery cell/module imbalance. This feedback mechanism allows the system to maintain configuration flexibility while ensuring battery performance and reliability.
Data Source
AI summary
Examples described herein provide a method that includes providing electric power at a first voltage level for a first auxiliary low voltage bus. The method further includes providing electric power at a second voltage level for a second auxiliary low voltage bus, the first voltage level differing from the second voltage level. The method further includes balancing, by a controller, the first voltage level and the second voltage level based at least in part on a voltage offset.