Contactless Power Sensing Device for Simplified Circuit Design
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Solution Overview
Problem
Traditional methods for measuring power consumption in multiple sites require numerous electricity meters and extensive cabling, leading to high installation costs and complexity, with existing solutions like Current Transformers (CTs) being cumbersome and expensive.
Innovation Solution
A contactless load monitoring method and device that senses current or voltage waveforms using electromagnetic induction, performs integration and digital processing, and calculates root mean square values, allowing for simplified circuit design and reduced labor costs by using a single sensing device per wire with a microprocessor for data processing and communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electricity meters are installed at each wire location, then power consumption measurement is achieved, but installation cost and complexity increase significantly
Solution Approach 1:
Multiple current transformer connections are merged into a single centralized connection point at the distribution panel. The patent consolidates numerous individual meter installations into one centralized measurement location, where multiple wires are collected and measured together, eliminating the need for separate electricity meters at each wire location.
Solution Approach 2:
Extension cords serve as intermediaries to transmit measurement data from the centralized current transformers at the distribution panel to the electricity meter mainframe. This mediator approach allows remote measurement points to communicate with the central processing unit without requiring direct physical connection at each measurement location.
2Ease of operation
If Current Transformers are connected in parallel on a bus line, then wire distribution becomes more organized, but labor cost increases
Solution Approach 1:
Multiple CT connections are merged onto a single bus line structure, organizing wire distribution centrally at the distribution panel. This consolidation improves organization by gathering all connections in one structured location rather than having分散 connections throughout the system.
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 enables efficient and cost-effective power consumption measurement with reduced installation complexity, achieving high linearity and accuracy through relative value measurement, which can be calibrated to absolute values, and supports scalable data transmission with minimal hardware requirements.
Implementation Method 1
the sensing device senses a change in the waveform of the current or the voltage based on an electromagnetic induction principle
Data Source
AI summary
A sensing device includes a housing positioned on an outer surface of a wire and a circuit board received in the housing. The circuit board has a sensing area for sensing the wire, such that the measurements obtained by the circuit board are relative values. Therefore, the circuit design of the circuit board can be simplified, and the size of the sensing device can be reduced.