Fuse Blow Detection Circuit With Switch Fault Diagnosis
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Solution Overview
Problem
Existing fuse blow detection circuits lack the accuracy to reliably detect a fuse blow in a circuit, especially when combined with potential faults in the measurement switch.
Innovation Solution
A fuse blow detection circuit is implemented with a detection line connected in parallel to the output circuit, featuring a detection resistance, a measurement switch, and a first resistance, along with a second resistance connected between the measurement switch and the battery-fuse connection point, utilizing voltage measurement sections and a controller to determine the fuse blow state based on measured voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple voltage detection circuit is used to detect fuse blow, then the device complexity is reduced, but the measurement precision and reliability of fuse blow detection deteriorate
Solution Approach 1:
The detection circuit is segmented into multiple functional modules: detection line with series-connected resistances (first resistance R1, second resistance R2), measurement switch S2, and voltage measurement section. This segmentation allows each component to perform a specific function, improving detection accuracy while keeping the overall circuit manageable in complexity
Solution Approach 2:
The patent introduces intermediate components (detection resistance Rdet, first resistance R1, second resistance R2) as mediators between the fuse and voltage measurement section. These intermediaries enable indirect detection of fuse blow status through voltage measurements, achieving high measurement precision without requiring direct complex measurement of fuse current
2Measurement precision
If a detection circuit with multiple components is used to improve fuse blow detection accuracy, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The detection circuit components serve multiple functions: the first resistance R1 and second resistance R2 are used for both voltage division during normal operation and for detecting fuse blow status; the measurement switch S2 is integrated into the existing switch S1 structure. This multi-functionality reduces the need for additional dedicated detection components, controlling circuit complexity while maintaining high measurement precision
Solution Approach 2:
The patent merges the detection function with the existing power switch S1 by integrating measurement switch S2 and detection resistance Rdet into the same circuit path. The voltage measurement section simultaneously measures both the voltage across the fuse and the detection voltage, combining multiple measurement functions into a single integrated system
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 configuration allows for highly accurate detection of fuse blows and measurement switch faults, distinguishing between fuse blow states and switch faults through distinct voltage measurements, enhancing reliability and fault diagnosis.
Implementation Method 1
a detection line on which a detection resistance, a measurement switch, and a first resistance are connected in series
Implementation Method 2
a first voltage measurement section that measures a battery voltage of the battery relative to a reference potential, and a second voltage measurement section that measures a detection voltage applied to the detection resistance relative to the reference potential
Data Source
AI summary
A fuse blow detection circuit disclosed herein is provided in an output circuit in which a battery and a fuse are connected in series. The fuse blow detection circuit includes a detection line on which a detection resistance, a measurement switch, and a first resistance are connected in series, the detection line being connected to the output circuit in parallel, a second resistance connected to a connection point between the measurement switch and the first resistance on the detection line and connected to a connection point between the battery and the fuse in the output circuit, a first voltage measurement section that measures a battery voltage of the battery relative to a reference potential, and a second voltage measurement section that measures a detection voltage applied to the detection resistance relative to the reference potential.