A discharge gap arc extinguishing method for an intrinsically safe inductive circuit

Abstract

The invention discloses a discharge gap arc extinction method of an intrinsic safety inductive circuit and belongs to the technical field of explosion-proof electrical safety. The intrinsic safety inductive circuit is composed of a power supply, a resistor and an inductor in serial connection, the positive end of the power supply is electrically connected with a resistor through a first line, the resistor is electrically connected with the inductor through a second line, the inductor is electrically connected with the negative end of the power supply through a third line, two ends of the inductor are inversely and parallelly connected with a diode, and two ends of each of the first, second and third lines are connected with an arc extinction circuit formed by parallel connection of the diode and a PCB (printed circuit board) discharge gap circuit. The diode and the PCB discharge gap circuit are parallelly and inversely connected to two ends of each line, open-circuit discharge sparks cannot form a most dangerous arc discharge stage, the discharge sparks can be extincted automatically, and the diode parallelly connected with the lines automatically cuts off the power supply in a reverse bias manner, and accordingly safety performance of the inductive circuit is improved remarkably.

Description

technical field [0001] The invention relates to the technical field of explosion-proof electrical safety, in particular to an arc extinguishing method for a discharge gap of an intrinsically safe inductive circuit. Background technique [0002] Intrinsically safe circuits used in explosive gas environments are defined according to the GB3836.4-2000 standard as: any electric spark or any thermal effect generated under the conditions specified in this standard (including normal operation and specified fault conditions) cannot ignite the specified explosive gas. The circuit in the gas environment, its specific performance is: the detection test under the specified conditions is carried out on the IEC (International Electrotechnical Commission, International Electrotechnical Commission) spark test device, and any part of the circuit cannot be ignited under the three conditions of short circuit, open circuit and grounding. concentration of explosive gas. [0003] For a typical i...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of the existing intrinsically safe inductive circuit's open-circuit arc discharge arc-extinguishing method, the control circuit is complicated, etc., the present invention provides an intrinsically safe inductive circuit discharge gap arc-extinguishing method, the intrinsically safe inductive circuit is composed of a power supply, a resistor and an inductance The positive end of the power supply is electrically connected to the resistor through the first line, the resistor is electrically connected to the inductor through the second line, the inductor is electrically connected to the reverse end of the power supply through the third line, and the inductor The two ends of the first, second and third lines are connected in parallel with an arc extinguishing circuit respectively; the arc extinguishing circuit is composed of a diode and a PCB discharge gap circuit connected in parallel; the diode is connected in antiparallel At both ends of the corresponding line, the anode of the diode is electrically connected to the output terminal corresponding to the PCB discharge gap circuit, and the cathode of the diode is electrically connected to the input terminal corresponding to the PCB discharge gap circuit

Images