Overcurrent Protection Device for Vehicular ECU
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Solution Overview
Problem
Existing overcurrent protection devices for vehicular electronic control units increase power consumption when attempting to detect and cut off overcurrents, making them complex and inefficient.
Innovation Solution
An overcurrent protection device with a first detector for non-operation and a second detector for operation, using current value and time thresholds specific to each state, and an overcurrent breaker to cut off power when thresholds are exceeded, without increasing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an overcurrent cutoff device determines whether overcurrent has flowed through the load based on overcurrent cutoff characteristic equivalent to fuse characteristic, then the load is protected from overcurrent, but the device becomes complicated and is enlarged, so that the power consumption increases
Solution Approach 1:
The patent changes the detection parameters from complex fuse characteristic equivalence to simple current value and time measurements. By monitoring only the current magnitude and duration, the system achieves overcurrent protection without the complexity of fuse characteristic analysis, thereby reducing power consumption while maintaining protection reliability.
2Reliability
If a fuse is used to mechanically cut off the connection between the load and the power supply upon occurrence of the overcurrent, then the load is protected from overcurrent, but the fuse is melted down and cannot be reused, requiring replacement of the component
Solution Approach 1:
The patent replaces the mechanical fuse cutoff system with an electronic detection and control system. Instead of using a physical fuse that melts and requires replacement, the system uses electronic sensors to detect overcurrent conditions and triggers an electronic cutoff mechanism, eliminating the need for component replacement and improving ease of repair.
3Device complexity
If the overcurrent cutoff device is configured to determine overcurrent based on current value and time with thresholds, then the device complexity is reduced, but the detection accuracy may be insufficient without separate detection for load operation states
Solution Approach 1:
The patent segments the overcurrent detection into two distinct modes: one for when the load is operating and another for when it is not. This segmentation allows the system to use different threshold criteria appropriate for each state, improving detection accuracy while keeping each individual detection mechanism relatively simple. The first threshold compares current against a first reference value, and the second threshold compares current against a second reference value, with each having associated time thresholds.
Data Source
AI summary
There is provided an overcurrent protection device configured to protect a load from an overcurrent. A first overcurrent detector configured to detect the overcurrent, based on a value of a current flowing through the load, time for which the current flows through the load, and an overcurrent cutoff characteristic upon non-operation of the load. An overcurrent breaker that cuts off the overcurrent to the load when the first overcurrent detector detects the overcurrent.