Safety grating

Abstract

The invention discloses a safety grating which comprises a protection circuit arranged in a shell, as well as an intrinsic safety direct current input interface and an intrinsic safety direct current output interface, which are arranged on the wall of the shell, wherein the protection circuit consists of two stages of power protection units and an anti-reverse absorption circuit of which the input end is electrically connected with the output end of the secondary power protection unit; the input end of the primary power protection unit is electrically connected with the intrinsic safety direct current input interface; the output end of the anti-reverse absorption circuit is electrically connected with the intrinsic safety direct current output interface through an output indicating circuit; the two stages of power protection units both comprise a power output protection circuit, a current sampling circuit, a timing soft start circuit, a voltage sampling comparison circuit and a switching tube; the input ends of the power output protection circuits are respectively and electrically connected with the output ends of the voltage sampling comparison circuits and the timing soft start circuits, and the output ends are respectively and electrically connected with the input ends of the current sampling circuits and the control ends of the switching tubes; and the output ends of the current sampling circuits are electrically connected with the control ends of the switching tubes.

Description

technical field [0001] The invention relates to an intrinsically safe circuit safety interface device applied in an explosive gas environment, in particular to a safety barrier. Background technique [0002] In order to ensure safety, the explosion-proof technology is applied to various industries and related professions, and with the development of technology and industry, automatic instruments and control devices are continuously introduced. The power supply devices connected to these instruments and devices are safe and reliable. There are certain problems. Therefore, it is a key technology to provide suitable intrinsically safe power supply to various intrinsically safe devices. Traditional intrinsically safe circuits limit the voltage and current in the circuit to an allowable range, and limit the energy to a safe range to ensure that the equipment is in normal operation or in the event of a fault such as short circuit or component damage. Electric sparks and thermal ...

AI Technical Summary

Problems solved by technology

Therefore, the above-mentioned traditional method has low power supply efficiency, small output intrinsically safe current, small load inductance and capacitance, and cannot automatically start and self-recovery, etc.

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