Magnetic Lock Anti-Tamper Screw for Smart Meters
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Solution Overview
Problem
Smart meters are vulnerable to magnetic tampering, which can result in inaccurate energy consumption readings due to external static magnetic fields affecting current sensing technology, posing a significant business risk.
Innovation Solution
An anti-tamper screw with a magnetic lock that remains locked in the absence of an external magnetic field and unlocks when a counterforce greater than the threshold is applied, disengaging the screw head from the body, allowing detection of tampering attempts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanent magnet is placed near the smart meter, then magnetic tampering occurs causing lower energy consumption readings, but the meter remains vulnerable to unauthorized access
Solution Approach 1:
The patent applies preliminary anti-action by pre-installing a magnetic lock mechanism in the anti-tamper screw that automatically responds to external magnetic fields. The magnetic lock is configured to detect the presence of external magnets before they can cause tampering, and immediately locks or unlocks the screw accordingly, preventing unauthorized access before it occurs.
Solution Approach 2:
The magnetic lock acts as an intermediary between the external magnetic field and the anti-tamper screw. Instead of allowing the magnetic field to directly affect the screw's security function, the magnetic lock mediates this interaction by converting the magnetic field detection into a mechanical locking/unlocking action, thereby protecting the measurement system from magnetic tampering.
2Ease of operation
If traditional anti-tamper screws are used, then unauthorized access is prevented, but magnetic tampering can still occur affecting current sensing
Solution Approach 1:
The patent merges two previously separate functions into a single integrated anti-tamper screw: the mechanical security function (preventing unauthorized access) and the magnetic field detection function (detecting magnetic tampering attempts). This is achieved by incorporating a magnetic lock mechanism directly into the screw structure, allowing it to respond to both mechanical removal attempts and magnetic field interference with a unified locking mechanism.
3Reliability
If the screw is designed to be secure against removal, then tamper detection is enabled, but the screw cannot be legally removed when needed
Solution Approach 1:
The patent applies dynamics by making the screw's security state changeable rather than fixed. The magnetic lock mechanism allows the screw to dynamically transition between locked and unlocked states based on external magnetic field conditions. This enables the screw to be securely locked during normal operation for tamper detection, but can be unlocked when a legitimate authority applies the appropriate magnetic field, thus resolving the contradiction between security and legal removability.
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
Minimizes the need for extensive updates or resets, reduces handling burdens, and effectively detects tampering by ensuring the screw remains secure until an external magnetic field is applied, thereby preventing unauthorized access and maintaining accurate energy readings.
Implementation Method 1
a lock for locking the head to the body and for disengaging the head from the body in response to an external magnetic field
Implementation Method 2
The moveable part may comprise, for example, a bearing (e.g., bearing B1, FIG. 5) or a magnet (e.g., magnet 804, FIG. 12B)
Implementation Method 3
The lock may be biased by a threshold force in an unstable equilibrium position whereby when an external magnetic counterforce greater than the threshold force is applied then the lock moves to a more stable equilibrium position
Data Source
AI summary
An anti-tamper system including: a fixing device and an anti-tamper detection device; the fixing device comprising a body and a head whereby the head having a larger cross section then the body for enabling a tool to engage and drive the body into a first material layer thereby makes a firm connection with the anti-tamper detection device between the head and the first material layer; the fixing device further comprising a lock wherein the head is locked to the body by the lock where there is no external magnetic field and wherein the head becomes disengaged from the body when the lock is unlocked by an external magnetic field; and whereby the anti-tamper detection device detects and records a change the connection when the head becomes disengaged.