Inductive Component Magnetic Fraud Detection in Electricity Meters
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Solution Overview
Problem
Modern electricity meters face challenges in detecting magnetic fraud attempts, as existing magnetic sensors have a limited coverage area, making it difficult to reliably detect fraud when magnets are positioned outside this area, and adding more sensors is costly and bulky.
Innovation Solution
The integration of an inductive component with a modified inductance value within the electric meter, combined with simple electronic components to compare the electric current with a predetermined threshold, allows for inexpensive and space-efficient fraud detection, expanding the detection zone and utilizing existing magnetic sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If additional magnetic sensors are distributed inside the meter to increase coverage area, then the fraud detection coverage area is improved, but the cost and device bulk increase
Solution Approach 1:
The inductive component serves dual purposes: it functions as a standard electrical component for power supply or communication, and simultaneously acts as a fraud detection sensor. When a magnet approaches, the inductive component's electrical characteristics change, providing fraud detection capability without requiring dedicated sensor hardware.
Solution Approach 2:
The existing inductive components in the electronic card serve themselves by providing both their original electrical function and fraud detection function. The components naturally respond to magnetic fields through their inductive properties, eliminating the need for separate detection mechanisms.
2Reliability
If a magnetic sensor is used to detect fraud attempts, then the detection capability is improved, but the coverage area is limited and detection reliability decreases when magnets are positioned outside the coverage area
Solution Approach 1:
The solution transitions from spatial detection (magnetic sensor measuring field strength at a distance) to electrical characteristic detection (inductive component measuring current changes). This dimensional shift allows detection based on the component's inherent electrical properties rather than external field measurements, expanding effective coverage.
Solution Approach 2:
The inductive component acts as an intermediary between the external magnet and the detection system. Instead of directly measuring the magnetic field, the system measures the electrical current changes in the inductive component that result from magnetic interference, providing indirect but more reliable detection.
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 solution effectively increases the fraud detection coverage area while maintaining cost-effectiveness and minimizing bulk, enabling reliable detection of fraud attempts even when magnets are positioned outside the original sensor's range.
Implementation Method 1
an inductive component having an inductance value capable of being modified by a field external magnetic generated for example by a magnet to carry out a fraud attempt
Implementation Method 2
An electric meter is thus conventionally provided with a magnetic sensor, for example a Hall effect sensor or a reed bulb, which detects the presence of an external magnetic field generated near the meter
Data Source
Figure 1
Figure 2~5
Figure 3
AI summary
The invention relates to a measuring device comprising a housing (2) in which an electronic board (10) is integrated, on which an inductive component (18; 20) is mounted. This component has an inductance value that can be modified by an external magnetic field (15), generated, for example, by a magnet (16), to carry out a fraud attempt. The measuring device includes fraud detection means adapted to detect a fraud attempt when an electric current flowing through the inductive component exceeds a predetermined current threshold.