Contactless Power Meter Using Hall-Effect Current Sensing
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Solution Overview
Problem
Existing power meters are bulky, costly, and difficult to install due to the use of current transformers and voltage sensors that require contact with the conductor, limiting customization and data transmission options.
Innovation Solution
A power meter using a hall-effect current sensor and contactless voltage sensor, eliminating the need for an iron core and conductor tapping, with a customizable output via an NFC interface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a current transformer with iron core and coil is used, then current sensing is achieved, but the power meter becomes costly and bulky
Solution Approach 1:
The patent replaces the traditional electromagnetic current transformer (iron core and coil) with a hall-effect sensor that uses magnetic field detection. This substitution eliminates the need for bulky iron cores and complex winding structures, significantly reducing the power meter's size and cost while maintaining current sensing capability through non-contact magnetic field measurement
Solution Approach 2:
The patent extracts and removes the iron core component from the current sensing system entirely. By using a hall-effect sensor that directly detects magnetic fields generated by current flow, the design eliminates the unnecessary iron core structure, simplifying the overall device architecture and reducing material requirements
2Measurement precision
If voltage sensor requires tapping into the conductor, then voltage sensing is achieved, but assembly becomes significantly complicated and voltage transformers are required
Solution Approach 1:
The patent replaces contact-based voltage sensing (which requires conductor tapping and voltage transformers) with non-contact electromagnetic sensing. The voltage sensor detects voltage through electromagnetic fields without physical contact with the conductor, eliminating complex assembly steps and the need for additional voltage transformer components
Solution Approach 2:
The patent introduces electromagnetic fields as an intermediary medium for voltage detection. Instead of directly tapping into the conductor through physical contacts, the system uses electromagnetic field coupling to transfer voltage information, enabling contactless sensing and simplifying the assembly process
3Measurement precision
If current transformer and voltage sensor are used, then power measurement is achieved, but size, weight, cost, and installation difficulty increase
Solution Approach 1:
The patent replaces heavy electromagnetic sensing components (iron cores, large coils, voltage transformers) with lightweight solid-state sensors. The hall-effect current sensor and contactless voltage sensor are significantly lighter than traditional electromagnetic components, reducing the overall power meter weight while maintaining measurement accuracy through advanced sensor technology
4Measurement precision
If traditional sensors are used, then power measurement is achieved, but customization and data transmission options are limited
Solution Approach 1:
The patent integrates an NFC interface into the power meter, enabling multiple communication protocols and data transmission methods. This universal communication capability allows the device to adapt to various applications and customization requirements, providing flexible data transmission options while maintaining core power measurement functionality
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
Reduces size and installation complexity while enabling flexible data transmission and customizable output, determining the state of powered devices efficiently.
Implementation Method 1
a hall-effect current sensor disposed in the housing and contactlessly sensing a current of a conductor signal transmitted along the conductor
Data Source
AI summary
A power meter includes a housing attached to a conductor, a hall-effect current sensor disposed in the housing and contactlessly sensing a current of a conductor signal transmitted along the conductor, and a voltage sensor disposed in the housing and contactlessly sensing a voltage of the conductor signal.