Spark discharge constant power arc extinguishing method for intrinsically safe Buck circuit

A spark discharge, intrinsically safe technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve problems such as reducing spark energy, achieve the effect of complete circuit structure and ensure safety performance

CN106383545AInactive Publication Date: 2017-02-08NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2017-02-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a spark discharge constant power arc extinguishing method for an intrinsically safe Buck circuit, belonging to the technical field of explosion-proof electrical safety. The intrinsically safe Buck circuit comprises a control circuit, a Buck circuit, a spark discharge constant power circuit, a striking trigger circuit and a blocking circuit, wherein the blocking circuit comprises an output blocking circuit and a control blocking circuit; the output blocking circuit is electrically connected with the Buck circuit; the control blocking circuit is electrically connected with the control circuit and the Buck circuit respectively; the striking trigger circuit is electrically connected with the spark discharge constant power circuit, the output blocking circuit and the control blocking circuit respectively; the spark discharge constant power circuit is electrically connected with the Buck circuit. The method achieves spark discharge constant power control on the open circuits of inductors, so that the electric spark discharge power is smaller than the minimum ignition power and the electric spark discharge energy is smaller than the minimum ignition energy, thus achieving the requirement that the arc power and the arc energy are smaller than the minimum ignition values.
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Description

technical field

[0001] The invention relates to the technical field of explosion-proof electrical safety, in particular to a spark discharge constant power arc extinguishing method for an intrinsically safe Buck 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. of explosive gases.

[0003] For intrinsically saf...

Examples

Embodiment Construction

[0017] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] figure 1 It is a schematic diagram of an existing intrinsically safe Buck circuit with a control circuit. The Buck circuit includes a power supply E, a switching transistor M1, a diode D, an inductor L, a capacitor C and a resistor R; One end of the inductor L is electrically connected to the cathode of the diode D, the other end of the inductor L is electrically connected to one end of the capacitor C, the other end of the capacitor C is electrically connected to the anode of the diode D, and the anode of the diode D is electrically connected to the negative side of the power supply E The terminals are electrically connected, and the resistor R is connected in parallel with the capacitor C. The control circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a capacitor C2, a capacitor C3, an oper...