High-Voltage Protection Apparatus for Electric Vehicle Safety
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Solution Overview
Problem
In hybrid and electric vehicles with high-voltage energy storage systems, there is a risk of accidental contact with live high-voltage lines during servicing, posing a danger to living organisms due to improper connection, as existing safety measures are inadequate in detecting and responding to human presence.
Innovation Solution
A protection apparatus for IT grids that includes a signal generator to feed a signal into the live lines, a detection device to analyze the signal's characteristics, and a control device to output a disconnection signal when a living organism is detected, using frequency-dependent impedance to identify human presence and actuate a controllable switching device to isolate the high-voltage lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing safety measures are used in IT grids, then the system structure remains simple, but the ability to detect and respond to human presence is inadequate
Solution Approach 1:
The protection apparatus applies preliminary action by continuously monitoring the live lines for impedance changes before actual contact occurs. The signal generator injects test signals and the detection device measures impedance in real-time, enabling early detection of human presence and triggering preventive disconnection before dangerous contact happens.
Solution Approach 2:
The patent replaces mechanical contact-based safety switches with an electrical impedance detection system. Instead of relying on mechanical interlocks or physical barriers, the system uses electrical measurements of impedance to detect human presence, allowing for more sensitive and automated safety monitoring without complex mechanical structures.
2Measurement precision
If impedance detection is used to identify living organisms, then detection accuracy improves, but the complexity of signal analysis increases
Solution Approach 1:
The system applies parameter changes by measuring impedance at multiple different frequencies rather than a single frequency. The signal generator injects test signals at various frequencies and the detection device measures impedance responses. By analyzing how impedance varies with frequency, the system can more accurately distinguish living organisms from other objects and reduce false detections.
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 prevents accidental contact by reliably detecting the presence of a living organism through impedance analysis and isolating the high-voltage lines, ensuring safety during vehicle servicing.
Implementation Method 1
living organisms have a frequency-dependent impedance, and this frequency-dependent impedance can be used to identify whether a living organism is touching the live lines of an IT grid
Data Source
AI summary
The present invention discloses a protection apparatus for an IT network having a first and a second live line, having a signal generator which is designed to feed a first signal to the first and/or to the second live line, having a detection device which is designed to detect the profile of the fed first signal in at least one live line, and having a control device which is designed to analyze the detected profile and to output a disconnection signal when the analysis of the detected profile indicates that a living organism is in contact with the first live line and the second live line. The present invention also discloses a method and a power supply system.