High-Voltage Signal Emission Device for EV Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current systems for indicating the zero-voltage state of onboard high-voltage power supplies in electric vehicles are not foolproof, as a malfunctioning signal light cannot distinguish between a zero-voltage state and a defective light, posing health risks to service personnel.
Innovation Solution
A motor vehicle system featuring a signal emission device that outputs a signal only when the high-voltage source is disconnected from the onboard high-voltage power supply, utilizing a low-voltage power supply for operation and measurement, ensuring safe manipulation by indicating the connection state through a visual signal like an LED, and allowing for indirect monitoring using inductive devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional signal light is used to indicate the zero-voltage state, then the indication function is simple, but the reliability is insufficient because a malfunctioning light cannot distinguish between zero-voltage state and defective light
Solution Approach 1:
The patent inverts the conventional indication logic: instead of indicating safety with light presence, it indicates safety with light absence. The signal emission device remains dark during normal operation and only emits light when disconnection is detected, transforming the indication approach to eliminate ambiguity between malfunction and actual state.
Solution Approach 2:
The patent introduces an intermediary evaluation device that actively monitors the voltage state and controls the signal emission device based on detected conditions. This intermediary layer separates the direct connection between voltage state and indication, adding a verification step that prevents false indications while maintaining system simplicity.
2Ease of operation
If the signal emission device is connected to the high-voltage power supply, then it can directly indicate the connection state, but it cannot be tested risk-free when connected
Solution Approach 1:
The patent introduces a low-voltage power supply as an intermediary to power the signal emission device and evaluation circuitry. This separate low-voltage system allows safe testing and operation of the indication mechanism without exposure to high-voltage dangers, while still accurately monitoring the high-voltage connection state through isolated sensing.
3Measurement precision
If a simple signal light is used, then the device complexity is low, but the measurement precision of voltage state is insufficient
Solution Approach 1:
The patent introduces an evaluation device as an intermediary that actively measures voltage presence and controls the signal emission accordingly. This addition transforms a simple passive indicator into an active monitoring system with precise voltage detection capability, while the intermediary nature of the evaluation device keeps the overall architecture manageable.
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
Provides a reliable indication of the zero-voltage state, ensuring safe manipulations by differentiating between safe and unsafe states, thereby reducing health risks for service personnel and allowing risk-free testing of the signal emission device.
Implementation Method 1
a signal emission device (18) configured to display a connection state of the high-voltage source (12) with the onboard high-voltage power supply system (10)
Implementation Method 2
indirect monitoring of the onboard high-voltage power supply, which can be performed, for example, using inductive measuring devices
Data Source
AI summary
A motor vehicle includes a high-voltage source for supplying consumers of a high-voltage on-board power supply system with electrical energy, an electrical separating device for separating the high-voltage source from the high-voltage on-board power supply system and a signal emission device for indicating the connection state between the high-voltage source and the onboard high-voltage power supply system. The signal emission device is activated for emission of a signal when the high-voltage source is separated from the onboard high-voltage power supply system, and is deactivated when the high-voltage source is connected to the onboard high-voltage power supply system. A non-activated signal emission device indicates a live state of the high-voltage on-board power supply system, thereby ensuring that a safe state of the onboard high-voltage power supply system is not falsely signaled in the event of a failure of the signal emission device, thereby eliminating risk to service personnel.