A mining isolated intrinsically safe led drive power supply

Abstract

A mining isolated type intrinsic safety LED driving power source comprises an input rectification filter circuit, an isolation transformer, an output filter circuit, a feedback sampling and switch tube controlling circuit and a switch tube crest voltage suppression circuit. The output side of the input rectification filter circuit is connected with the isolation transformer, the output side of the isolation transformer is connected with the output filter circuit and the feedback sampling and switch tube controlling circuit respectively, the switch tube crest voltage suppression circuit is connected with the output side of the feedback sampling and switch tube controlling circuit, the output side of the switch tube crest voltage suppression circuit is connected to the input side of the isolation transformer, and the output side of the output filter circuit is connected with an LED load. The mining isolation type intrinsic safety LED driving power source is characterized in that a passive PFC circuit is additionally arranged between the input rectification filter circuit and the isolation transformer, and a dual-output overvoltage and overcurrent protection circuit is additionally arranged between the output filter circuit and the LED load.

Description

technical field [0001] The invention relates to a power supply system for mine safety lighting, in particular to a mine isolated intrinsically safe LED drive power supply. Background technique [0002] A good underground lighting and power supply system can provide a high-quality working environment for coal mines, and it also plays an important role in reducing underground accidents. Using traditional incandescent lamps as the main lighting in coal mines not only has low illumination, strong glare, and low efficiency, but also the circuit itself is unreliable. In recent years, with the rapid development of the LED industry, domestic industrial and mining enterprises have begun to combine the concept of LED lighting with the special lighting technology in coal mines, and implement mine green lighting, that is, intrinsically safe LED lighting systems. Intrinsically safe power supply (intrinsically safe power supply), that is, under normal operation and fault conditions, the ...

AI Technical Summary

Problems solved by technology

[0003] At present, for mining intrinsically safe LED power supplies, most of them use low-power power supplies (≤10W). In order to achieve the required power level, a larger power supply module needs to be connected in parallel, which not only increases the size but also increases the cost.

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