Intrinsically safe power supply with high output power

Abstract

The invention relates to an intrinsically safe power supply with high output power which comprises a direct current converting circuit and a constant current circuit and at least two sets of overvoltage protection circuits, overcurrent circuits, heavy load slow protection circuits, heavy load fast protection circuits and restoring circuits, and the two sets of circuits are of the same structure, an input alternating current power supply is accessed into the direct current converting circuit, an intrinsically safe power supply is loaded and accessed into an intrinsically safe output end with an output voltage of 18.5 V, an output current of 1.5 A and an output power not less than 30 W. The intrinsically safe power supply with high output power provided by the invention has advantages and active effects, when spark discharge generated from short circuits and collision exits or the load is heavy to a certain extent, the circuits are fast detected and protected, and circuit power output is cut off, therefore fast eliminating sparks. According to the invention, the device meets the requirements of GB3836.4, works under the condition of constant current, is convenient to be applied to driving LED (Light Emitting Diode) lamps, after elimination of abnormal statuses, the circuits are automatically unprotected to restore normal work, the circuits are simple in structure and low in cost.

Description

Technical field [0001] The invention relates to a power supply device, in particular to an intrinsically safe power supply with high output power. Background technique [0002] Intrinsically safe power supplies are used in a variety of intrinsically safe equipment in dangerous environments such as coal mines, petroleum, and chemical industries. The so-called intrinsically safe type is an explosion-proof type, which is regulated by the national standard GB3836.4. The design of an intrinsically safe circuit is to limit the energy of the spark generated when the load or a specified circuit part is short-circuited within a certain range. In addition to meeting the requirements of the GB3836.4 standard, it must also pass the intrinsically safe circuit spark ignition experiment conducted by the national designated explosion-proof inspection and testing agency. [0003] At present, the maximum output power of domestic intrinsically safe power supplies is generally around 18W. Tradition...

AI Technical Summary

Problems solved by technology

This has formed the bottleneck of the maximum output power of the current intrinsically safe power supply (at about 18V). If this power bottleneck cannot be broken through, it will not be able to meet the requirements of the equipment for increasing the output capacity of the intrinsically safe power supply.

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