Industry news

2016June

LED lamp characteristics and technical parameters of high power analysis

From: www.szbako.com Data:21/06/2016

high power LED lamp is a kind of LED lamp beads, relative to small power LED lamp, high power LED lamp of higher power, brightness is brighter, the prices are higher. Small power LED lamp rated current rated current is 20mA, high 20mA, basically can be counted as a great power. General power has: 0.5W, 0.25W, 1W, 3W, 5W, 8W, 10W, etc.. The main units of brightness for LM (LM) and small power unit of luminance is generally MCD (milli candela, 1cd=1000mcd, also is the luminous intensity I.

1cd=1lm/sr (LM /steradian) =1 candle. Explanation is that the light source in the specified direction of solid angle dΩ within a luminous flux or the light transmission of the flux dΦ the quotient of the two is luminous intensity I (unit: candela, CD). The cover available PC control, high temperature resistant a 135 degrees.

high power led to product classification:

currently do for a new green, environmental protection, energy saving light source is widely used in automobile lamps, flashlights, lighting and other places. LED high power is so called, is mainly for small power LED, the current classification standard summed up in three ways: the first kind of

is based on the size of the power can be divided into 0.5W, 1W, 3W, 5W, 10W....100W range, according to the total power package after the molding product for different.

second can according to the different packaging process is divided into: large size epoxy resin package, imitation piranha type epoxy resin package, aluminum plate (MCPCB) package, TO package, SMD package, MCPCB power integrated package and so on

third can according to different degree of attenuation can be divided into low depreciation and non power products low light power products.

, of course, because of the large power LED parameters of their own more, according to the different parameters will have different classification standards, in this no longer class. LED high power still belong to one of the LED packaging products, is to make the semiconductor lighting to the general lighting in the field of the most important one.

high power LED product application note matters

high power LED products and devices in the application process, heat, electrostatic protection, welding has a great influence on its characteristics, the need to attract application side attaches great importance to the customer. cooling

, high power LED products:

due to the current semiconductor light-emitting diode chip technology, there is a need to improve the photoelectric conversion efficiency of the LED, especially high power LED, because of its high power, about 60% of the electrical energy into heat energy released (along with the development of semiconductor technology, photoelectric conversion efficiency will gradually improve), which requires client terminal in the application of high power LED products, to do a good job of cooling, to ensure that the work rate of the normal work of the LED products. Cooling

1. requirement

appearance and the material: if the finished product sealing requirements is not high, with the outside air environment directly convection occurs, it is recommended with finned aluminum or copper heat sink.

2. effective cooling table area:

for 1W high power white LED (the other is basically the same color) our recommended effective heat dissipation for the heat sink surface area sum & Ge; 50-60 square centimeters. For 3W products, recommended heat sink effective heat sink surface area of the total ≥ 150 square centimeters, higher power as the situation and test results increased, as far as possible to ensure that the heat sink temperature is not more than 60.

3. connection method:

high power LED substrate and the heat sink connection please ensure the contact surface is smooth, good contact, in order to strengthen the two contact surfaces with suggestions in at the bottom of the LED substrate or bulk thermal film coated on the surface of a layer of heat conducting silicone grease thermal grease thermal conductivity & Ge; 3.0W/m.k, thermal grease requirements of coated evenly and properly, then screw pressure is fixed.

, high power LED products of electrostatic protection

LED belongs to semiconductor devices, are more sensitive to electrostatic, especially for white, green, blue, purple led to do to prevent static electricity generation and elimination of electrostatic.

1. electrostatic:

1 friction: in daily life, and any two different material object contact and separation, can produce static electricity, and static electricity of the most common method is the triboelectrification. The better the insulation of the material, the easier it is to generate electricity. In addition, any two different substances of the object after contact and then separated, also can produce static electricity. Induction of the

: for conductive materials, due to the electron energy in the free flow of its surface, as will be placed in an electric field in, because same-sex repulsion, opposites attract, the positive and negative ions will be transferred, on its surface will produce charge.

conduction: for conductive materials, the electron energy in its surface free flow, such as contact with charged objects, the charge transfer will occur. Damage to the LED electrostatic

2.:

due to instantaneous electric fields generated by heat, the LED locally injured and performance as the leakage current increases rapidly and can still work, but lower brightness, life impaired.

because of the electric field or current damage to the LED insulation layer, so that the device can not work (complete destruction), the performance of dead lights.

3. ESD protection and the elimination of measures:

for the whole process (production, testing, packaging, etc.) all direct contact with the led the staff to do a good job in the prevention and measures to eliminate static electricity, the main /font>

1, shop shop floor electrostatic proof and well grounded.

2, working platform for the anti-static work table, the production of good grounding.

3, operator wear anti-static clothing, anti-static bracelet, gloves or foot ring.

4, application ion fan.

5, good welding electric iron grounding measures.

6, packaging using anti-static materials.

, high power LED products welding

1, welding note it is best to choose a constant temperature soldering iron, soldering temperature for 260 DEG C, iron and led welding disc a contact time less than 3S;

2, such as high power LED encapsulation silica, silica gel of the highest temperature resistance for 180 DEG C, thus led the welding temperature shall not exceed 170 DEG C, welded by low temperature soldering iron and low temperature solder paste (silk), iron and led welding disc a contact time less than 3S.

scope of application of:

is mainly used for guesthouses, hotels, malls, pubs, parks, playgrounds, public places and all that is needed to light the lamp.

classification:

LED power is so called, is mainly for small power LED, the current classification standard I summarize three kinds:

of which the first is based on the size of the power can be divided into 0.5W, 1W, 3W, 5W, 10W....100W range, according to the total power package after molding products in terms of the different second different.

according to their different packaging process is divided into: large size epoxy resin package, imitation piranha type epoxy resin package, aluminum plate (MCPCB) package, TO package, SMD package, MCPCB power integrated package and so on

third can according to different degree of attenuation can be divided into low and high power light low degradation products and non power production Goods.

, of course, because of the large power LED parameters of their own more, according to the different parameters will have different classification standards, in this no longer class.

LED high power still belong to one of the LED packaging products, is to make the semiconductor lighting to the general lighting in the field of the most important one. Deep understanding of the large power LED package, master the technical parameters and characteristics, to understand the LED lighting and display products are important.

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