Sensor Control Unit Short-Circuit Protection Circuit
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Solution Overview
Problem
Existing sensor systems in automotive and electric vehicles are vulnerable to short-circuit damage due to high short-circuit currents, particularly in low-impedance connections, which can lead to sensor destruction and measurement inaccuracies.
Innovation Solution
A control unit with a short-circuit protection circuit using a switchable transistor between sensor connections and a grounding system, which includes a low-impedance resistor for current limiting and a high-impedance resistor for bypass, preventing short-circuit currents without significantly affecting measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a low-impedance connection is used for sensor grounding to ensure measurement accuracy, then measurement precision is improved, but the system becomes vulnerable to short-circuit damage and reliability deteriorates
Solution Approach 1:
The control unit proactively detects potential short-circuit conditions by monitoring current flow through the sensor and grounding connection before actual damage occurs. When a short-circuit condition is detected (current exceeding threshold), the control unit immediately interrupts the grounding connection, preventing sensor destruction and maintaining system reliability while preserving measurement accuracy during normal operation
Solution Approach 2:
The control unit acts as an intermediary between the sensor and grounding connection, inserting intelligent control logic that monitors electrical parameters and dynamically manages the grounding connection. This intermediary function enables the system to maintain low-impedance grounding when safe while preventing short-circuit damage, resolving the contradiction between measurement accuracy and reliability
2Measurement precision
If high voltage is applied to the sensor during normal operation to ensure adequate signal levels, then signal quality is improved, but the risk of short-circuit damage increases
Solution Approach 1:
The control unit continuously monitors the current flowing through the sensor and grounding connection, creating a feedback loop that detects abnormal conditions. When the monitored current exceeds a predetermined threshold indicating a potential short-circuit, the control unit immediately responds by interrupting the grounding connection, thereby protecting the sensor from damage while allowing high voltage operation during normal conditions for adequate signal quality
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
Effectively protects sensors and low-impedance connections from short-circuit damage while maintaining measurement accuracy by interrupting short-circuit currents and providing robustness against short-circuit events.
Implementation Method 1
The transistor is arranged in a circuit breaking path, in which a low-impedance second resistor can be located in series with the transistor
Data Source
AI summary
The invention relates to a control unit (6) for evaluating the sensor signal of a sensor (2), comprising at least one first sensor connection (21) and a second sensor connection (22) for connecting the sensor (2), wherein the second sensor connection (22) is connected to a short-circuit protection circuit (23), which is arranged between the second sensor connection (22) and a grounding (3), and which comprises a switchable transistor (7), by way of which the grounding (3) of the second sensor connection (22) can be interrupted.