Magnetic Sensor for Non-Intrusive Electrical Device Status Detection
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Solution Overview
Problem
Conventional methods for determining the usage status of electrical devices require modifying power lines, which is complex and can damage existing wires, and are not suitable for multi-wire applications, especially two-wire systems.
Innovation Solution
A sensor system comprising a magnetic detector, analog-to-digital converter, and controller that detects magnetic field changes around a power line to determine the usage status of an electrical device without modifying the original power lines, suitable for single-wire, two-wire, or three-phase power lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional ammeter or power measuring equipment is used to determine usage status, then measurement capability is achieved, but installation complexity increases and power lines must be modified
Solution Approach 1:
The patent replaces conventional electrical measurement methods (ammeter, power measuring equipment) with a magnetic field-based detection system. The sensor detects current flow through magnetic field sensing around the power line, eliminating the need to disconnect or modify electrical connections. This substitution of mechanical/electrical measurement with magnetic field detection resolves the contradiction by maintaining measurement precision while dramatically reducing installation complexity.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the current flow and the detection system. Instead of directly measuring electrical parameters requiring circuit modification, the system uses the magnetic field generated by current flow as a non-intrusive mediator that can be detected externally. This intermediary approach enables usage status detection without any modification to the power line infrastructure.
2Ease of operation
If clamp meter is used for non-intrusive measurement, then installation simplicity is improved, but applicability to two-wire systems is lost
Solution Approach 1:
The patent designs a sensor system that universally detects magnetic fields around power lines regardless of wire configuration. The sensor can detect single-wire, two-wire, and three-phase power line arrangements through its ability to sense the composite magnetic field signature. This universal detection capability maintains installation simplicity while achieving versatility across different wiring configurations, resolving the contradiction between ease of operation and adaptability.
Solution Approach 2:
The patent employs parameter changes in the magnetic field detection approach, specifically detecting the presence, absence, and characteristics of magnetic fields generated by different wire configurations. By monitoring changes in magnetic field parameters (strength, pattern, frequency) rather than requiring specific wire arrangements, the system achieves both installation simplicity and broad applicability to various power line types including two-wire systems.
3Ease of operation
If power line separation is performed for two-wire application, then clamp meter usability is achieved, but user willingness decreases due to complexity
Solution Approach 1:
The patent enables the sensor system to automatically detect and adapt to the power line configuration without requiring user intervention for wire separation or reconfiguration. The magnetic field detection automatically identifies the usage status regardless of whether single-wire, two-wire, or three-phase configuration is present. This self-service capability eliminates the need for users to perform complex power line separation tasks while maintaining clamp meter-style ease of installation.
4Measurement precision
If additional components are added to determine usage status, then measurement capability is achieved, but cost increases
Solution Approach 1:
The patent employs a cost-effective magnetic field sensor that can be manufactured at low cost using standard magnetic detection components. The sensor uses an integrated circuit with magnetic field sensing elements that are inexpensive to produce in volume. This approach achieves accurate usage status detection while maintaining low manufacturing costs, resolving the contradiction between measurement precision and ease of manufacture.
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
Enables easy installation and accurate determination of device status without damaging power lines, suitable for various power line configurations, and reduces user complexity and costs.
Implementation Method 1
The magnetic detector is close to the power line to detect a magnetic field change around the power line to correspondingly generate an analog signal
Data Source
AI summary
A sensor for sensing a usage status of an electrical device and its associated method are disclosed. The sensor is disposed at a near-end of a power line of the electrical device. The sensor provided with a magnetic detector, an analog-to-digital converter and a controller. The magnetic detector is close to the power line to detect a magnetic field change around the power line to correspondingly generate an analog signal. The analog-to-digital converter (ADC) is used to receive the analog signal and convert the analog signal to a digital signal. The controller is used to receive the digital signal and generate an indication signal to accordingly learn at least one of statuses of being turned on and turned off the electrical device.