Power Source Device Ground Fault Redundancy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing onboard power source devices with redundant power supply paths fail to maintain power delivery when a ground fault occurs, as both paths experience voltage drops, leading to potential power loss for the load.
Innovation Solution
A power source device configuration that includes a first battery, a second battery, a power supply line, and a fuse system with varying current capacities and a relay system, allowing for selective disconnection of power paths to maintain power delivery even in the event of a ground fault, ensuring redundancy and preventing voltage drops across both paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connection switch is provided between two batteries to enable redundant power supply, then electric power can be supplied to the load even if one battery fails, but the system complexity increases with additional switches and wiring
Solution Approach 1:
The power supply system is divided into separate protected paths with independent fuse elements. Instead of using complex switching mechanisms to achieve redundancy, the system uses segmented fuse protection on multiple paths, allowing simple connectivity while maintaining reliability through independent fault isolation.
Solution Approach 2:
Fuses are used as disposable protective elements that can be easily replaced. Rather than implementing complex, expensive switching systems with multiple connection switches and control circuits, the patent uses simple, inexpensive fuse elements that provide reliable protection and can be quickly replaced after operation, reducing overall system complexity.
Data Source
AI summary
A power source device that includes a first battery; a second battery; a power supply line that supplies power to a plurality of loads; a power source line that connects the first battery and the power supply line; a first fuse that is connected between the power source line and the power supply line; a fuse portion whose current capacity is made smaller or larger than a current capacity of the first fuse depending on whether a potential of the power source line is higher or lower than a reference potential; and a first switch that is connected between the second battery and the fuse portion, and is connected to the power supply line via the fuse portion.