Lighting Power Bus Authentication via Cryptographic Load Detection
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Solution Overview
Problem
The challenge in the lighting industry is to prevent unauthorized loads from connecting to and drawing power from lighting devices, as they can compromise safety, compatibility, and regulatory compliance, while existing solutions lack effective methods to detect and manage such unauthorized connections.
Innovation Solution
A lighting device with a power supply and controller that uses cryptographic messages to instruct authorized loads to consume a predetermined amount of power during a selected time-interval, allowing the system to detect unauthorized loads by measuring power consumption and take corrective actions, such as sending notifications or altering power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a power supply provides power to multiple loads without authorization verification, then the ease of operation and adaptability are improved, but the reliability and safety deteriorate due to unauthorized loads compromising system integrity
Solution Approach 1:
The system performs preliminary authorization verification by sending cryptographic messages to loads before providing power. The controller verifies load authorization status and communicates expected power consumption in advance, preventing unauthorized loads from compromising system integrity while maintaining ease of connection for authorized devices
2Measurement precision
If the system monitors power consumption continuously to detect unauthorized loads, then the measurement precision and reliability improve, but the use of energy and device complexity increase
Solution Approach 1:
The system performs power consumption monitoring and unauthorized load detection at periodic intervals rather than continuously. The controller selects specific time intervals to measure power consumption and compare against expected values from cryptographic messages, achieving accurate detection while minimizing energy consumption by the monitoring system
Solution Approach 2:
The system uses feedback by comparing measured power consumption against expected power consumption values communicated through cryptographic messages. When a discrepancy is detected, the system performs additional verification actions to confirm unauthorized load presence, maintaining high detection precision while optimizing energy usage through conditional monitoring
Data Source
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AI summary
A lighting device comprising a controller arranged to convey a cryptographic message to a load indicative of an instruction for said load to consume an amount of power during a selected time-interval; determine the power consumed during said selected time-interval and determine a condition indicative of an unauthorized load when said determined power is different from one which is expected.