PoE Power Distribution Using Split Circuits Above 100 W
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Solution Overview
Problem
Existing power delivery systems using Ethernet cables face regulatory challenges when delivering more than 100 W of power, requiring additional components and complex designs to ensure safety, especially when multiple circuits are inadvertently shorted.
Innovation Solution
A power delivery system using Ethernet cables that splits power into multiple circuits, each limited to less than 100 W, with integrated protection mechanisms to ensure compliance with regulatory limits while allowing total power delivery exceeding 100 W.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple independent low voltage circuits are used to deliver more than 100 W, then power delivery capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent divides the power delivery system into multiple independent low voltage circuits (e.g., multiple twisted pairs in Ethernet cable), each capable of delivering less than 100 W. By segmenting the total power requirement across multiple circuits, the system achieves high power delivery capability while maintaining compliance with building codes that limit individual circuit power to under 100 W.
2Power
If multiple independent low voltage circuits are used to deliver more than 100 W, then power delivery capability is improved, but electrical components and cost increase
Solution Approach 1:
The patent makes the Ethernet cable serve multiple functions: it simultaneously transmits data and delivers power through its multiple twisted pairs. This multi-functionality eliminates the need for separate power cables and associated connectors, reducing component count and manufacturing cost while achieving high power delivery capability.
3Power
If power delivery over Ethernet is implemented with more than 100 W, then power capability is improved, but regulatory compliance becomes more difficult
Solution Approach 1:
The patent applies different characteristics to different parts of the power delivery system: each individual low voltage circuit (twisted pair) is designed with specific voltage and current limits to comply with building codes, while the aggregate system delivers high total power. This local differentiation allows simultaneous compliance with regulatory limits and achievement of high power capability.
Data Source
AI summary
In an embodiment, a power delivery system includes a first current limiter and a second current limiter in parallel with each other, wherein a direct current (DC) voltage is provided to each of the first current limiter and the second current limiter; a first transformer electrically coupled to the first current limiter; a second transformer electrically coupled to the second current limiter; first differential signal traces electrically coupled to the first transformer; and second differential signal traces electrically coupled to the second transformer, wherein the DC voltage is transmitted from the first transformer to the first differential signal traces simultaneous with the DC voltage being transmitted to the second differential signal traces by the second transformer. The power delivery system includes a third transformer electrically coupled to third differential signal traces. The third differential signal traces comprise a return current path corresponding to the DC voltage.