Modified Pierce Oscillator Arc Detection for HV Electronic Assemblies
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Solution Overview
Problem
The increasing on-board electrical system voltage in modern motor vehicles, up to 800 V, poses a risk of electric arcs between higher potential lines and ground potential components, leading to potential damage and safety hazards, as existing detection methods are not cost-effective or material-efficient and may not reliably detect arcs in electronic assemblies.
Innovation Solution
A device comprising a transmission unit generating an output signal and an evaluation unit connected via radio or cable, which detects deviations in the signal caused by an arc, allowing for the safe de-energization of affected electronic assemblies by generating a control signal to switch off the transmission unit or connected apparatus, using a low-power, cost-effective LC oscillator and PCB coil configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing arc detection methods are used in high-voltage systems, then arc detection capability is provided, but cost-effectiveness and material efficiency deteriorate
Solution Approach 1:
The patent replaces complex mechanical/electronic arc detection systems with an acoustic detection system. The acoustic sensor detects sound waves generated by electric arcs, converting a physical/electrical detection problem into an acoustic measurement problem. This substitution achieves reliable arc detection while reducing system complexity and cost.
Solution Approach 2:
The patent introduces sound waves as an intermediary medium for arc detection. Instead of directly detecting electrical parameters, the system uses acoustic sensors to detect the sound waves generated by arcs. This intermediary approach enables indirect but effective arc detection with simpler and more cost-effective components.
2Power
If high-voltage systems are implemented to meet energy demands, then energy supply capability is improved, but the risk of electric arcs and safety hazards increases
Solution Approach 1:
The patent implements a feedback mechanism where acoustic sensors continuously monitor for arc-generated sound waves. When an arc is detected through acoustic signal analysis, the system triggers protective measures such as shutting down affected circuits or isolating problematic components. This closed-loop feedback system enables real-time detection and response to arc hazards in high-voltage systems.
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
The solution effectively and reliably detects electric arcs, enabling the safe de-energization of affected electronic assemblies, reducing the risk of damage and injury, while being cost-effective and material-efficient, even when arcs occur in other locations within the vehicle.
Implementation Method 1
the acoustic sensor being arranged to detect the sound waves generated by the electric arc
Data Source
AI summary
The invention relates to a device for detecting an electric arc in an electronic assembly, having: a transmission unit for generating an output signal, and an evaluation unit for receiving the output signal, where the transmission unit and the evaluation unit are connected to one another, where the transmission unit comprises an oscillator unit that generates an output signal having a frequency and/or an amplitude, and where the evaluation unit is configured to detect deviations, caused by an arc, in the output signal from the transmission unit. There is in particular a provision to implement the oscillator unit by way of a modified Pierce oscillator having an inverter, where the quartz is replaced by a detector coil. The invention furthermore relates to an electronic assembly of a motor vehicle having an apparatus to be controlled, in particular having a heating apparatus and having said device, and to a method for detecting an electric arc in an electronic assembly.