Mining intrinsic safety redundant power supply circuit

Abstract

The invention discloses a mining intrinsic safety redundant power supply circuit. The circuit comprises a first intrinsic safety power supply, a second intrinsic safety power supply and a DPDT relay, and the positive electrode and the negative electrode of the first intrinsic safety power supply are respectively connected with a first normally open contact and a second normally open contact of the DPDT relay; and the positive electrode and the negative electrode of the second intrinsic safety power source are connected with the first normally-closed contact and the second normally-closed contact of the DPDT relay respectively, and the common end of the DPDT relay serves as the intrinsic safety output end after redundancy. According to the intrinsically safe power supply circuit, redundancy and automatic switching of the first intrinsically safe power supply and the second intrinsically safe power supply are realized through the DPDT relay, and the normally open contact and the normally closed contact of the DPDT relay are isolated, so that the first intrinsically safe power supply and the second intrinsically safe power supply meet the requirements of isolation and voltage resistance, and an intrinsically safe redundant power supply circuit specified by GB3836.4-2010 is met.

Description

technical field [0001] The invention belongs to the technical field of mine equipment and relates to a mine intrinsically safe redundant power supply circuit. Background technique [0002] At present, the intrinsically safe equipment in coal mines is powered by a single intrinsically safe power supply. For key system equipment such as intrinsically safe network switches and integrated substations in coal mines, if the single intrinsically safe power supply for power supply fails, the entire system will not work, which will seriously affect the safety of coal mines and the normal production of coal mines. Designing an intrinsically safe redundant power supply circuit is of great significance for intrinsically safe redundant power supply for key intrinsically safe equipment in coal mines. [0003] Based on the intrinsic safety considerations of underground coal mines, GB3836.4-2010 stipulates that the intrinsically safe power supplies of different circuits in underground coal...

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Problems solved by technology

[0003] Based on the intrinsic safety considerations of underground coal mines, GB3836.4-2010 stipulates that the intrinsically safe power supplies of different circuits in underground coal mines cannot be "shared" and have a 500VAC isolation withstand voltage requirement. Therefore, traditional redundant power supply methods for mine intrinsically safe redundant power supplies cannot be used. to fulfill

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