Network Switch Emergency Lighting via Hardware Bypass

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Solution Overview

Problem

Existing network devices that provide power for environmental lighting via Power-over-Ethernet (PoE) struggle to meet emergency lighting standards, such as UL924, due to reliance on software components, making it difficult to certify compliance.

Innovation Solution

A network switch and luminaire system that operates in a communication mode using a network protocol to provide power, but switches to an emergency lighting mode by bypassing the processor and using hardware logic to directly supply power to lighting elements via a network cable when an emergency signal is detected, eliminating the need for software-driven components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If network switch uses processor and software components to provide Power-over-Ethernet (PoE) power to luminaires, then the network switch can negotiate power with luminaires via network protocol, but the device cannot meet emergency lighting standards such as UL924 that require hardware-based power provision independent of software

Engineering Contradiction:

Improvenetwork protocol compatibilityVSAvoidemergency lighting compliance

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The network switch is segmented into two independent power provision paths: a software-driven PoE path for normal operation and a hardware-driven emergency path for emergency lighting. This segmentation allows each path to be optimized for its specific function while maintaining overall system versatility.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A hardware-based emergency power circuit acts as an intermediary that can independently provide power to luminaires without relying on the software-controlled PoE negotiation path. This intermediary ensures emergency lighting compliance while the PoE path maintains network protocol compatibility.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If network switch relies on processor and firmware for PoE power provision, then the system can dynamically negotiate power allocation, but the system becomes unreliable during emergencies when software components may fail or be unavailable

Engineering Contradiction:

Improvedynamic power negotiationVSAvoidemergency power delivery

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The emergency power circuit is pre-configured and ready to provide power independently of the software-controlled PoE negotiation. This preliminary preparation ensures that power can be delivered immediately during emergencies without relying on dynamic negotiation that may fail when software is unavailable.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The software-driven PoE negotiation mechanism is supplemented with a hardware-based emergency power delivery mechanism. This substitution replaces the unreliable software-dependent path with a reliable hardware path for emergency situations, while preserving the ease of operation benefits during normal operation.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If network switch provides power through PoE negotiation via network protocol, then the system can provide both data communication and power, but the system cannot guarantee power delivery when network communication fails

Engineering Contradiction:

Improveintegrated data and power deliveryVSAvoidpower delivery independence

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The power delivery function is segmented into two independent paths: a PoE path that operates with data communication and an emergency power path that operates independently of network communication. This segmentation ensures that power delivery can continue even when network communication fails.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The network switch is designed with multi-functionality to handle both normal PoE operation and emergency power delivery through the same physical interface. This universality allows the device to adapt to different operational modes while maintaining reliable power delivery capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9860948B1Techniques for providing environmental lighting using network infrastructure

Publication Date: 2018.01.02 ABL IP HLDG LLC

AI summary

A network switch and luminaire provide environmental lighting via network infrastructure. The network switch operates in a communication mode that communicates, via a network interface, data with the luminaire over a network. Some portion of the data may be lighting control information for the luminaire that is produced by a control device. The network uses a network protocol that provides power to the luminaire using a network cable, where the luminaire uses the power to illuminate a lighting element. In response to a signal received by an emergency control input on the network switch, the emergency circuitry switches the network switch from the communication mode to an emergency lighting mode. The emergency lighting mode bypasses the processor used for communicating data via the network interface, and provides, via the network cable attached to the network interface, only power to the luminaire.