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Intrinsically safe communications circuit

A circuit and communication signal technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as the intrinsic safety of power circuits and achieve the effect of low resistance

Inactive Publication Date: 2013-05-29
PEPPERL FUCHS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, it is not possible to make power circuits intrinsically safe in this way

Method used

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  • Intrinsically safe communications circuit
  • Intrinsically safe communications circuit
  • Intrinsically safe communications circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0051] Such as figure 1 As shown, an electrical circuit 1 includes a source 2, a load 3, a parallel pair of positive cables 4 and 5 between the source 2 and the load 3, a parallel pair of negative cables 6 and 7 between the load 3 and the source 2, and typically Inflammable arc prevention device denoted 8.

[0052] As described below, the flammable arc prevention device 8 includes monitoring means in the form of inductive responses located at both ends of each cable in the positive cable pair 4 and 5 and at both ends of each cable in the negative cable pair 6 and 7. 9, 10, 11, 12, 13, 14, 15 and 16. The monitoring devices 9-16 are adapted to monitor the positive cable pair 4 and 5 and the negative cable pair 6 and 7, and detect whether the current and / or voltage in one cable 4 or 5 of the positive cable pair deviates from the other, and the negative cable pair Whether the current and / or voltage in one cable 6 or 7 of the pair deviates from the other.

[0053] The flammable ...

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PUM

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Abstract

An electrical circuit comprising a power supply, a load, a pair of parallel positive cables between the power supply and the load, a pair of parallel negative cables between the load and the power supply, and incendive arc prevention means, comprising: monitoring means adapted to detect if the current and / or voltage in one of the pair of cables deviates from the other, and a control means adapted to fully or partially isolate the power supply from the pair of cables if the monitoring means detects that their current and / or voltage has deviated from the other, characterised in which: the electrical circuit comprises a common positive section between the power supply and the pair of positive cables, and a common negative section between the pair of negative cables and the power supply, in which a first modulation means is adapted to generate a modulated communications signal.

Description

technical field [0001] The present invention relates to intrinsically safe communication circuits, particularly for, but not limited to, use in flammable environments, especially gas group category IIC, hydrogen and acetylene, and the following, for example, gas group IIB and for gas and / or dust IIA. Background technique [0002] Field instruments and equipment in intrinsically safe environments are remotely controlled via electrical communication circuits. Traditionally, communications are provided in the same electrical circuit as the power supply that drives the field instruments. The applicant's WO2006 / 003445 discloses a modern version of this configuration, in which signaling is passed along two metal-wire Fieldbus segments. [0003] However, new technologies such as Ethernet offer the possibility to have a separate communication circuit bundled with the power supply circuit. This provides greater flexibility and communication speed, which allows more modern and comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H9/00H04L12/10
CPCH04L12/10H02H9/008
Inventor 雷纳托·基特切纳尔G·罗格尔M·凯斯勒
Owner PEPPERL FUCHS GMBH