The Dushanping coal mine in Xishan, China's Shanxi province, replaced all the original fluorescent lamps with OSRAM LED instead. It is understood that LED miner's lamp can not only reduce accidents, but also reduce maintenance costs, save energy consumption (about 61%), and save electricity costs up to 220,000 yuan per year. Due to low light reflectance, low contrast, high temperature, and strong corrosion, underground coal mines have always been one of the most difficult lighting applications. Today, using LED lamps instead of traditional incandescent lamps greatly reduces the difficulty factor for this application.
This batch of 20W LED miner's lamp has two kinds of exterior designs: The circular LED lamp is mainly used for the general lighting under the coal mine underground, and the square LED lamp is mainly used for the long-distance illumination in the tunnel. The light reflectance in the coal mine is low, so a light source with a very high light output is required. OslonSSL is ideal for this application with its 104lm warm white light to 130lm cold white light flux.
Mr. Li Zhonghua, chairman of the group of LED coal mine lamp manufacturers, Shenzhen General Technology Co., Ltd. pointed out: “Oslen SSL LEDs were selected because of their high reliability and excellent light efficiency. More importantly, these LEDs have The higher light output meets the design requirements, and the incandescent lamp used previously had an average illumination of only 45lx, and the average illumination of these LEDs was as high as 82lx, supplemented by advanced optical components, we were able to achieve this low contrast environment. Reduce glare."
In addition to high light efficiency, these LED lighting applications can pass the rigorous test in the coal mine environment, have coal mine safety certification, explosion-proof certification, can pass salt spray, waterproof testing and 1000 hours of combustion test.
Mr. Zhong Jiecong, Senior Marketing Director of OSRAM Opto Semiconductors Asia Ltd., Asia, said: “The use of LED as a light source in coal mine lighting is a general trend and is growing rapidly. We are very pleased that China’s coal provinces can adopt Oslon SSL LEDs. They are the most compact 1W LEDs on the market. And they do not have a fragile glass enclosure. We also hope that the use of these LED lights can reduce the risk of downhole workers."
The LED is very rugged, with no fragile glass housing and easily broken filaments. In addition, LEDs provide reliable lighting for more than 50,000 hours compared to incandescent bulbs with a service life of up to 3,000 hours. Miner's lamp maintenance interval is extended from three months to one year. According to a study by the National Institute of Occupational Safety and Health (NIOSH), the accident rate can be up to 53% during the maintenance and repair of light bulbs or lamps; and the long life and safety packaging of LEDs (without glass enclosure) This reduces the chances of facing these dangers.
Metal oxide semiconductor field effect (MOS) transistors can be divided into N-channel and P-channel. P-channel silicon MOS field-effect transistors have two P+ regions on the N-type silicon substrate, which are called source and The drain is not conductive between the two poles, and when a sufficient positive voltage (gate ground) is applied to the source, the surface of the N-type silicon under the gate exhibits a P-type inversion layer, which becomes a channel connecting the source and the drain. . Changing the gate voltage changes the density of the holes in the channel, thereby changing the resistance of the channel. Such a MOS Field Effect Transistor is called a P-channel enhancement type field effect transistor. If the surface of the N-type silicon substrate is free of gate voltage, the P-type inversion layer channel already exists, and the appropriate bias voltage can increase or decrease the resistance of the channel. Such a MOS field effect transistor is referred to as a P-channel depletion field effect transistor. They are collectively referred to as PMOS transistors.
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