Integrated Circuit Fault Detection for LED Illumination Control
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Solution Overview
Problem
In electrical or electronic devices, particularly in vehicles, frequent switching of loads like solenoids and light-emitting diodes can cause unintended illumination when testing for faults, which is disruptive and potentially destructive, especially in dashboard applications.
Innovation Solution
An integrated circuit with a controllable switching element and a test unit that performs fault detection autonomously, using a memory to determine the type and timing of tests, avoiding line breakage detection during normal operation to prevent illumination issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If line breakage detection tests are performed during normal operation, then fault detection capability is improved, but unintended illumination of light-emitting diodes occurs which is disruptive and potentially destructive
Solution Approach 1:
The system performs preliminary configuration of test parameters and timing in a memory device before actual operation. The control unit retrieves test configuration data from the memory device to determine when and how to perform line breakage detection tests, ensuring tests are scheduled during safe periods when illumination will not cause disruption or damage to light-emitting diodes.
Solution Approach 2:
The control unit continuously monitors the operational state of the integrated circuit and light-emitting diodes, using this feedback information to dynamically adjust test execution timing. Based on the monitored state, the control unit determines the optimal moments to perform line breakage detection tests, preventing tests during conditions that would cause harmful illumination while maintaining effective fault detection coverage.
2Productivity
If autonomous testing is implemented in the integrated circuit, then testing efficiency is improved, but device complexity increases due to additional control and memory components
Solution Approach 1:
The control unit and memory device are integrated within the existing integrated circuit structure, combining fault detection functionality with the primary switching operations. The control unit utilizes the existing microprocessor and standardized bus interface, while the memory device shares the integrated circuit's power supply and control signals, thereby reducing overall system complexity despite adding autonomous testing capabilities.
Solution Approach 2:
The memory device serves multiple functions: storing test configuration data, recording test results, and providing operational state information. The control unit performs both primary switching control and autonomous test management, eliminating the need for separate dedicated testing hardware and reducing overall device complexity while maintaining high testing efficiency.
Data Source
AI summary
An integrated circuit has a controllable switching element, the load path of which is arranged between an output of the integrated circuit and a supply potential. A test unit is connected to the connections of the switching element in order to carry out tests. A control unit is connected to the test unit via at least one control line. The sequence of tests is carried out dependent on signals on the control line(s). A memory is connected to the control unit the content and the type of which determines the time of the tests. The memory is connected to an input of the integrated circuit in order to enter the content.