Security Device Power-Source Queries for Tamper Detection
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Solution Overview
Problem
Existing security devices with external tamper switches or buttons fail to reliably distinguish between power outages and tampering attempts, especially in hostile environments, leading to mechanical issues and failed testing.
Innovation Solution
Security devices query the power source of other devices in the system to determine if a power loss is due to a tampering event or a power outage by comparing the primary (AC) and secondary (battery) power sources, using communication protocols to verify the power status across the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external tamper switches or physical buttons are used to detect tampering, then the device can trigger security alarms when unplugged, but the switches create mechanical issues due to different tolerance and wall plate designs and fail in hostile testing environments
Solution Approach 1:
The patent replaces mechanical tamper switches and physical buttons with an electrical power monitoring system. The system detects tampering by monitoring changes in electrical power characteristics (current draw, power consumption patterns) when a device is disconnected or tampered with, eliminating all mechanical moving parts and tolerance-related issues inherent in switch-based systems
Solution Approach 2:
The patent introduces power monitoring circuitry as an intermediary between the power source and the security device. This intermediary continuously monitors electrical parameters and can detect tampering attempts without requiring direct mechanical contact or switches, thereby resolving the mechanical compatibility issues with different wall plate designs
2Reliability
If mechanical tamper switches are used, then the device can detect physical disconnection, but the switches often fail standard testing when exposed to a hostile testing environment, such as a very acidic vapor chamber
Solution Approach 1:
The patent eliminates mechanical switches entirely and replaces them with electrical field-based detection. The power monitoring system uses electrical current and voltage measurements to detect tampering, which are not affected by chemical environments like acidic vapor chambers that cause mechanical switch failure
Solution Approach 2:
The patent employs electrical circuitry that is inherently more resistant to environmental degradation than mechanical switches. The electrical components can be designed to be sealed and protected, making them suitable for hostile environments without requiring complex protective mechanisms
3Measurement precision
If power loss detection is used without querying other devices, then the response time is faster, but the system cannot distinguish between power outages and tampering attempts
Solution Approach 1:
The patent implements a feedback mechanism where security devices query each other about their power status when a power loss is detected. The system sends out queries to other devices on the network, and based on their responses, determines whether the power loss is due to a widespread outage or localized tampering. This feedback loop provides accurate classification while minimizing delay through efficient communication protocols
Data Source
AI summary
Methods, systems, and apparatuses are described for detecting tampering to a security system. A device may determine whether the device lost power due to a power outage or a tampering attempt. The device may send, to another device on the premises, a request for an indication of the power source providing power to another device. The device may receive, from another device, a response indicating the power source providing power to another device. Based on the power source providing power to another device, the device may send a notification.