Wireless Gateway Isolation Circuit for Intrinsically Safe Antennas

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Solution Overview

Problem

Conventional wireless sensor network gateways face challenges in powering and communicating with access point smart antennas in hazardous environments due to the need for intrinsic safety standards, which are costly and complex to implement, especially requiring additional external intrinsic safety barriers.

Innovation Solution

A wireless sensor network gateway with safe side and hazardous side circuitry, along with isolation circuitry, that receives power from a non-intrinsically safe source and communicates data with antennas in hazardous environments, forming an intrinsic safety barrier to meet safety standards without the need for external barriers, using power and data isolation circuits to ensure safe operation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional wireless sensor network gateways are used to power and communicate with antennas in hazardous environments, then intrinsic safety standards must be implemented using external intrinsic safety barriers, but this increases device complexity and installation cost

Engineering Contradiction:

Improveintrinsic safetyVSAvoidexternal intrinsic safety barriers

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the intrinsic safety barrier functionality directly into the gateway device by integrating isolation circuitry into the power circuit and data input/output circuit. This merging eliminates the need for separate external intrinsic safety barriers, reducing system complexity while maintaining intrinsic safety requirements for hazardous environment operation

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The isolation circuitry acts as an intermediary element within the gateway that provides the necessary intrinsic safety barrier between the non-intrinsically safe power source and the intrinsically safe antennas. This internal mediator fulfills the safety requirement without requiring external barrier devices

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If external intrinsic safety barriers are used to meet safety standards, then intrinsic safety is achieved, but installation complexity and cost increase

Engineering Contradiction:

Improveintrinsic safety complianceVSAvoidinstallation complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The intrinsic safety barrier function is merged into the gateway's internal circuitry through integrated isolation circuits in both the power and data pathways. This consolidation eliminates the need for separate external barrier components, simplifying installation while ensuring compliance with intrinsic safety standards for hazardous environments

Inventive Principle:

Principle #5Merging (Combining)

3Use of energy by moving object

If non-intrinsically safe power sources are used to power the gateway, then power availability is improved, but safety risks increase in hazardous environments

Engineering Contradiction:

Improvepower availabilityVSAvoidignition risk

Core Design Contradiction:

Use of energy by moving objectVSObject-affected harmful factors

Solution Approach 1:

The isolation circuitry serves as an intermediary barrier between the non-intrinsically safe power source and the hazardous environment interface. This internal barrier allows the gateway to operate from standard power sources while preventing energy transfer that could cause ignition, thus maintaining both power availability and safety

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The gateway is segmented into distinct electrical zones through the isolation circuitry: a non-intrinsically safe zone containing the power source and processing circuits, and an intrinsically safe zone interfacing with the antennas. This segmentation allows high-power operation while isolating hazardous environment components

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution simplifies the installation and reduces costs by eliminating the need for external intrinsic safety barriers, ensuring safe and efficient power and data communication to antennas in hazardous environments while meeting intrinsic safety standards.

Implementation Method 1

The isolation circuitry includes a power isolation circuit that couples the safe side power circuit to the hazardous side power circuit and forms an intrinsic safety barrier between the safe side power circuit and the hazardous side power circuit

Methodology Applied

Scientific EffectIntrinsic safety barrier:

Data Source

PatentUS11843243B2Wireless sensor network gateway with integral intrinsic safety outputs for field mounted access point antennas

Publication Date: 2023.12.12 ROSEMOUNT INC

AI summary

A wireless sensor network gateway includes safe side circuitry, hazardous side circuitry and isolation circuitry, which are supported by a housing. The safe side circuitry includes a safe side power circuit, and a safe side data input/output (I/O) circuit. The hazardous side circuitry includes a hazardous side power circuit, and a hazardous side data I/O circuit. The isolation circuitry divides the safe side circuitry from the hazardous side circuitry. The isolation circuitry includes a power isolation circuit that couples the safe side power circuit to the hazardous side power circuit and forms an intrinsic safety barrier between the safe side power circuit and the hazardous side power circuit, and a data isolation circuit that couples the safe side data I/O circuit to the hazardous side data I/O circuit and forms an intrinsic safety barrier between the safe side data I/O circuit and the hazardous side data I/O circuit.