Power Supply Interconnected Output Detection
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Solution Overview
Problem
Conventional power supplies for lighting, particularly those classified as UL Class 2, face challenges in preventing interconnected output channels from exceeding the 100 W power limit, leading to non-compliance with UL standards, and existing solutions are costly.
Innovation Solution
A power supply that detects interconnected output channels by measuring and comparing load voltages, shutting down when an interconnection is detected to prevent exceeding the 100 W limit, allowing for compliance with UL standards without the need for additional costly measures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional techniques (non-Class 2 power supplies in combination, multiple Class 2 power supplies, or isolation features) are used to prevent UL standard violations, then safety compliance is improved, but cost increases
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring output voltages and comparing them to detect interconnections. The system measures the voltage on each output channel, compares voltages between channels, and automatically shuts down power supply when interconnection is detected, creating a closed-loop safety system that maintains compliance without additional hardware
Solution Approach 2:
The power supply system performs self-diagnosis by automatically detecting interconnections between its own output channels through voltage comparison. The system monitors its own operational state and takes corrective action (shutting down) when violations are detected, eliminating the need for external monitoring devices or complex isolation hardware
2Reliability
If voltage comparison detection is implemented, then UL standard compliance is improved, but device complexity increases
Solution Approach 1:
The control circuit performs multiple functions using the same components: it regulates power output, monitors voltage levels, detects interconnections through voltage comparison, and controls shutdown sequences. This multi-functionality approach avoids adding separate dedicated circuits for each safety function, maintaining simplicity while ensuring compliance
Data Source
AI summary
Systems and methods for detection of interconnected outputs of a power supply are provided. A first channel of a power supply is activated, such that power is supplied to a first load connected to the first channel. A first load voltage is measured for the first load. A second load voltage is measured for a second load connected to a second channel of the power supply. The second load voltage is compared to the first load voltage to generate an interconnection result. The power supply is shut down when the interconnection result indicates that the second load voltage matches the first load voltage, such that all channels of the power supply do not supply power to any load connected thereto.