Power Cord EM Sensor Array for Noninvasive Usage Detection
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Solution Overview
Problem
Existing methods for determining the usage parameters of machines, such as power consumption and operational states, are invasive and pose safety risks, especially for high-end equipment, and are not suitable for all types of machines, particularly those without data ports or sensitive to line noise.
Innovation Solution
A non-invasive electromagnetic measurement system using an array of sensors along the power cord to measure electromagnetic fields generated by the current flowing through the machine, which includes a microprocessor and communication circuitry for data analysis and calibration to determine the machine's operational state without direct contact with the conductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If smart plugs are used to measure current consumption, then usage parameters can be determined, but safety risks and equipment integrity issues arise due to invasive connection
Solution Approach 1:
The patent uses electromagnetic fields as an intermediary to transfer information about current consumption without direct electrical contact. The sensor detects electromagnetic fields generated by current flow in the power cord, allowing measurement while maintaining physical isolation between the measurement device and the equipment being monitored.
Solution Approach 2:
The patent replaces the mechanical/electrical connection method (smart plugs requiring direct insertion into power outlets) with an electromagnetic field-based detection method. This substitution eliminates the need for invasive electrical connections while preserving the ability to measure current consumption parameters.
2Measurement precision
If split core current transformers are used to measure current, then current flow can be determined, but installation complexity and safety concerns increase due to requiring cord disassembly
Solution Approach 1:
The patent employs electromagnetic fields as an intermediary that can be detected through the outer insulation of power cords without requiring physical access to internal conductors. This allows the measurement device to function through intact cord insulation, eliminating the need for cord disassembly while maintaining measurement capability.
Solution Approach 2:
The patent creates a non-invasive copy of the current measurement function by detecting electromagnetic fields externally, rather than requiring direct contact with conductors. This copied measurement approach preserves accuracy while eliminating installation complexity associated with cord disassembly.
3Extent of automation
If RF transmitters are placed near machine plugs, then communication capability is achieved, but line noise interference increases affecting sensitive equipment
Solution Approach 1:
The patent extracts the communication function from the power connection interface. Rather than placing transmitters near the machine plug (which would be close to sensitive conductive leads), the communication device is positioned separately and uses electromagnetic field detection through the power cord, removing the source of potential RF interference from the sensitive equipment interface.
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
This system allows for accurate and reliable estimation of power consumption and operational states of machines without invasive methods, reducing safety concerns and compatibility issues, while maintaining the integrity of high-end equipment.
Implementation Method 1
measuring an electromagnetic property of the electrical conductor with the electromagnetic sensor
Data Source
AI summary
An electromagnetic apparatus (EMA) for measuring electromagnetic properties of an electrical conductor such as a power cord is provided. Methods of using the EMA are also provided. The EMA includes a plurality of electromagnetic sensors (EMSs) disposed in an array along a length and a width of the EMA. The EMA further includes circuitry such as a microprocessor, communication circuitry, and power circuitry. The circuitry is in electrical communication with the EMSs.