Parallel Filter Circuits for Fast Fault Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing systems for detecting fault conditions in sensing circuits, such as on-board charging devices, often require redundant mechanisms and additional electronics to ensure rapid detection and response to failure conditions, leading to increased complexity and cost.
Innovation Solution
A parallel filtering system with two circuits operating at different frequencies, where a second circuit with a higher frequency detects failure conditions faster than a first circuit, allowing for quicker system disablement without the need for buffer circuits, and providing redundant detection through independent filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant detection mechanisms and additional electronics are used to ensure rapid detection and response to failure conditions, then reliability is improved, but device complexity increases
Solution Approach 1:
The sensing circuit is divided into two independent parallel circuits, each with its own filter operating at different frequencies. This segmentation allows each circuit to independently detect failure conditions without interfering with the other, providing redundant detection capability while maintaining manageable complexity through modular design
Solution Approach 2:
The system performs preliminary filtering at two different frequencies before the failure condition detection stage. By pre-filtering the sensed voltage at both a first frequency and a second frequency, the system prepares multiple detection pathways in advance, enabling rapid failure detection without requiring complex post-detection processing
2Speed
If a single filter operates at a high frequency to detect failure conditions rapidly, then speed is improved, but measurement precision deteriorates due to insufficient filtering
Solution Approach 1:
The filtering function is segmented into two parallel filtering operations at different frequencies. The first filter operates at a first frequency to provide initial filtering, while the second filter operates at a second frequency to provide additional filtering. This segmentation allows the system to achieve both rapid detection and precise measurement by combining the results from both filtering pathways
Solution Approach 2:
The system changes the frequency parameter of the filters to optimize both speed and precision. By operating one filter at a first frequency and another filter at a second frequency, the system can tune each filter's response characteristics. The different frequency parameters allow one filter to respond faster while the other provides more thorough filtering, resolving the trade-off between speed and precision
Data Source
AI summary
In at least one embodiment, a system comprising a first circuit and a second circuit is provided. The first circuit includes a first filter filtering a first input signal and generating a first filtered output signal. The first circuit includes a first comparator comparing the first filtered output signal to a first threshold value and providing a first output signal indicative of a failure condition to one or more first processors. The second circuit includes a second filter filtering the first input signal and generating a second filtered output signal to filter the first input signal in less time than the first filter filtering the first input signal. The second circuit includes a second comparator comparing the second filtered output signal to a second threshold value and providing a second output signal indicative of the failure condition to one or more second processors.