Vehicle Power Supply Voltage Balancing via Load Control
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Solution Overview
Problem
Existing electric power supply control systems in vehicles face challenges in promptly eliminating voltage differences between multiple power systems due to battery deterioration and component characteristics, requiring time-consuming charging methods to balance voltages.
Innovation Solution
An electric power supply control system with a controller that adjusts the output of DC-DC converters and specific loads, such as cooling fans, to promote power consumption in systems with higher voltages and reduce power supply to those with lower voltages, thereby rapidly balancing voltages between independent power systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging is performed to increase the voltage of a low-voltage electric power supply system, then the voltage difference between systems is eliminated, but the process requires a time period and cannot promptly eliminate the voltage difference
Solution Approach 1:
The invention changes the operational parameters of loads by adjusting their output levels based on voltage differences between power supply systems. When a voltage difference exceeds a threshold, the controller increases output levels of specific loads in the higher-voltage system, thereby rapidly consuming power and eliminating the voltage difference without time-consuming charging processes.
2Reliability
If the output level of specific loads is increased in the first electric power supply system, then power consumption of the first secondary battery is promoted and voltage difference is eliminated, but the specific load may generate harmful effects such as overheating
Solution Approach 1:
The invention implements a feedback mechanism where the controller continuously monitors both the voltage difference between power supply systems and the operational status of specific loads. When increasing output levels to eliminate voltage differences, the controller adjusts based on feedback regarding temperature and other harmful effects, thereby preventing overheating while maintaining voltage balance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively and promptly eliminates voltage differences between electric power supply systems by optimizing power consumption and supply, ensuring efficient operation and preventing overheating.
Implementation Method 1
a DC-DC converter connected between i) the first secondary battery and the first load, and ii) the second secondary battery and the second load
Data Source
AI summary
An electric power supply control system includes a plurality of electric power supply systems and a controller connected to the electric power supply systems. Each of the electric power supply systems includes a first secondary battery, a first load, a second secondary battery, a second load, and a DC-DC converter connected between the first secondary battery and the first load, and the second secondary battery and the second load. When a charge voltage of the first secondary battery of a first electric power supply system that is any one of the electric power supply systems becomes higher than the charge voltage of the first secondary battery of an electric power supply system other than the first electric power supply system by a predetermined voltage or more, the controller increases a level of output from a specific load in the first electric power supply system.