Differential Rogowski Coil EMI Detection for ESD and Lightning
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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 a processing circuit, including integrator, comparator, and time-to-digital converters, to sense current flow and determine the nature of EMI events based on amplitude and duration thresholds, distinguishing between ESD and lightning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional EMI detection methods are used, then EMI events can be detected, but the detection process intrudes on the circuit operation and cannot distinguish between different EMI sources
Solution Approach 1:
The patent introduces a Rogowski coil as an intermediary sensing element that magnetically couples to the circuit conductor without direct electrical contact. This magnetic coupling mechanism allows the detector to sense current transients from different EMI sources (lightning vs. ESD) through their distinct magnetic field signatures, enabling source classification without circuit intrusion or complex internal circuitry in the protected device
Solution Approach 2:
The patent replaces traditional electrical contact-based detection methods with magnetic field sensing. The Rogowski coil detects current transients through electromagnetic induction rather than direct electrical connection, substituting a simpler magnetic sensing mechanism for complex electrical measurement systems that would require circuit intrusion and sophisticated signal processing to differentiate EMI sources
2Reliability
If no detection system is used, then the circuit operates without intrusion, but EMI events cannot be identified or classified
Solution Approach 1:
The Rogowski coil serves as a non-intrusive intermediary that captures EMI event information through magnetic field coupling. It detects current transients from both lightning and ESD events without requiring electrical connection to the circuit, preserving circuit reliability while capturing essential EMI information (amplitude, duration, waveform characteristics) needed for event identification and source classification
Solution Approach 2:
The patent utilizes differences in temporal parameters (pulse width, rise time) and amplitude characteristics of current transients to distinguish between lightning and ESD events. The processing circuit analyzes these parameter variations in the Rogowski coil output signal to classify EMI sources, thereby recovering lost information about EMI events without compromising circuit operation
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 without intruding on the circuit, providing digital data for analysis and storage.
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
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.