Differential Rogowski Coil EMI Detection for ESD and Lightning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing technologies lack the ability to non-intrusively detect and classify electromagnetic interference (EMI) events, particularly distinguishing between lightning and electrostatic discharge (ESD), which can cause electronic circuit malfunctions.
Innovation Solution
A detector utilizing a differential Rogowski coil and processing circuit to sense current flow, integrate signals, and use comparators and time-to-digital converters to distinguish between EMI events caused by ESD and lightning based on amplitude and duration thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no detection device is used, then the circuit operates without additional components, but the ability to detect and classify EMI events is lost
Solution Approach 1:
The Rogowski coil serves multiple functions: it senses current flow in the circuit and simultaneously detects EMI events from different sources (lightning, ESD). The processing circuit integrates multiple detection functions (amplitude comparison, duration measurement, event classification) into a single system, achieving multi-functionality that resolves the contradiction between detection capability and system complexity.
2Measurement precision
If a simple current sensor is used, then the device complexity is low, but the precision to distinguish between ESD and lightning is insufficient
Solution Approach 1:
The processing circuit is segmented into distinct functional modules: an integrator circuit for signal integration, a first comparator for amplitude threshold detection, a second comparator for duration threshold detection, and time-to-digital converters for precise measurement. This segmentation enables high measurement precision for distinguishing ESD from lightning while organizing complexity into manageable, specialized components.
Solution Approach 2:
The system uses parameter changes to achieve precise classification: it measures both the amplitude magnitude and duration of current pulses, then compares these parameters against predetermined thresholds. By monitoring changes in multiple parameters (amplitude, duration) rather than a single parameter, the system achieves high classification accuracy. The processor determines ESD when amplitude exceeds a first threshold, and lightning when amplitude exceeds a higher second threshold, demonstrating parameter-based differentiation.
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 detector effectively identifies and classifies EMI events as ESD or lightning, enabling non-intrusive detection and data storage for later retrieval, thus preventing circuit malfunctions.
Implementation Method 1
The differential Rogowski coil is configured to sense current flow in at least a portion of the circuit and supply a coil output signal indicative of the sensed current flow
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A detector and method for detecting electromagnetic interference (EMI) events in a circuit include using a differential Rogowski coil and a processing circuit. The differential Rogowski coil is configured to sense current flow in at least a portion of the circuit and supply a coil output signal indicative of the sensed current flow. The processing circuit is coupled to receive the output signal from the differential Rogowski coil. The processing circuit is configured, from the output signal, to detect when an EMI event has occurred in the circuit and determine whether the EMI event is due to electrostatic discharge (ESD) or due to lightning.