Supply Circuit Current Limiter for Automotive Reset Signaling
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Solution Overview
Problem
Conventional electronic circuits face challenges in maintaining a predefined current level during undervoltage conditions, such as those caused by short circuits, which can lead to incorrect signaling of reset states in automotive applications, potentially compromising safety and reliability.
Innovation Solution
Incorporating a current limiter arrangement in the supply circuit to limit the current to a predefined value, ensuring that a reset current level is maintained even during faults like short circuits, thereby enabling reliable communication of error states to external systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional supply circuits are used without current limiting, then circuit simplicity is maintained, but current increases during short circuits preventing proper reset state signaling
Solution Approach 1:
The current limiter arrangement serves as a protective intermediary that adds minimal complexity to the supply circuit while significantly improving its ability to maintain predefined current levels during faults. The component is inserted between the supply generation circuit and the interface circuit to provide current limiting functionality.
2Reliability
If the interface circuit is disabled during undervoltage to prevent incorrect signaling, then false error states are avoided, but reliable communication of actual error states to external systems is lost
Solution Approach 1:
The current limiter arrangement enables the interface circuit to remain enabled during undervoltage conditions by preventing excessive current from reaching it. This intermediary protection allows the interface circuit to maintain its error state signaling functionality while being protected from fault conditions.
Data Source
AI summary
A supply circuit is provided including a supply generation circuit coupled to a supply terminal. A voltage deviation detection circuit is adapted to detect a voltage deviation in an internal supply voltage. A current limiter arrangement is adapted to limit a current through the supply generation circuit to a predefined value.