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Brightest flashlight they use only the diameter of 5mm LED assembly into a lamp, powered by three AAA batteries; some 3, 6 or 9 0 5W of straw hat LED combination of a rechargeable battery. The practical effects of this flashlight is not ideal: the absence of reflective bowl, use of LED lens of its own scattering angle, issued by the light scattered and can not be taken away; This article describes the flashlight to overcome these shortcomings of the traditional LED flashlight using a single high-power LED production, allows the LED to avoid weaknesses.
The single LED high-power flashlight is a single light-emitting diode (LED) as light source of a new lighting tool, it has low power consumption, durability, brightness, etc., can be used for nocturnal, climbing, camping, medical, maintenance, etc.. However, this flashlight price several hundred dollars to several thousand dollars, and usually the market is difficult to see. I make a single high power flashlights, the cost of only a few dozen, and the use effect is very good.
The choice of LED high-power LED power 1W, 3W, 5W, 10W, integrated brightness, life time, and cooling and other factors, 3W is the most appropriate choice. Due to limited battery capacity, the luminous efficiency is the first consideration, the production select the CREE company XLmap 7090XR-E series of white LED Series LED luminous efficiency classification.
CR18650 industrial lithium core, then decided to use (18 for battery diameter is 18mm, 650 on behalf of the length is 650mm) capacity of 2600mAh, readily available in the electronic market. Lithium battery charger can be used to market cell phone charger and a battery box restructuring.
Circuit using the AMC7135 AMC7135 is an ultra-low dropout current regulator, the work voltage of 2. 7 ~ 6V, a single constant-current output 350mA, no external components and output short / open circuit protection and thermal protection. Used in this two the AMC7135 parallel driver LED current of 700mA (choice of three ACM7135 current 1A, but this LED heat will obviously, and the extra brightness the human eye is difficult to see the difference, and cause the waste of electricity) The IN4148 circuit to prevent battery reverse burned IC. Only three components of the entire circuit. The board may use the two-layer board production, can also choose the finished circuit board.
