LED lamps and lanterns can also be referred to as the light engine

LED light engine ( 光引擎) It is to point to include LED encapsulation ( Components) (or LED array Module) , LED drive, as well as other brightness, thermal, mechanical and electrical components of the overall portfolio. The device to go through a practice to match the LED lamps and lanterns connector is connected directly to the branch circuit, the LED lamps and lanterns scheme into don't use the standard lamp holder.

this definition looks like very perfect, but generally makes people inducements.

MaoYuHai teach the LED light engine to summarize the definition of a more shallow, namely + constant current drive power LED light source in a piece of aluminum substrate.

as China LED net expert, professor MaoYuHai has been renowned in the industry, and the light has a long list of title: Cornell university electrical engineering associate professor, institute of electrical and electronics engineers, senior members, professor of electronic engineering, tsinghua university, China electronics missionaries, IEEE senior member, at Stanford university, a visiting professor at tsinghua university, deputy director of the radio electronics research institute. When added: Effie lai photoelectric chairman.

if the LED lamps and lanterns can also be called light engine? MaoYuHai pointed out that, of course, can not. As the car cannot be called a engine, engine is the car powertrain, but is not equal to the car, plus the shell talent into a car. Such products need to have light engine, because all the lamps and lanterns has a variety of appearance. Some lamps and lanterns and even can be called art.

take the incandescent lamp, it just the brief bulb is a way, coupled with the candle light or at best minimal Christmas lights. But it's but there are all kinds of shape. Especially the crystalline light is all kinds of arts and crafts, poles are beautiful. But the LED must also add the pole messy constant current drive source talent is equivalent to an incandescent lamp as homework ( Connected to 220 v can bright) 。 If make out of the LED light engine, it is also connected to 220 v can be bright like incandescent lamp ( Of course also need a matching radiator) 。 This helps standardization on the one hand, on the other hand can also greatly facilitate the shell ( And radiator) Promote it can plan.

LED light engine technical difficulties reading

the drive constant current source with the LED boards, the first difficulty is not space.

ball steep light, for example, assume that the usual switch constant-current source on the LED aluminum plate, a total of more than 30 components, in the big inductor, transformer and capacitor, element will block the light, components, the more the worse reliability. As a result, the switch constant-current source is not available.

this kind of circumstance, can handle by linear constant current power supply.

but MaoYuHai shows at the same time, the use of linear constant current source is not usually a feasible scheme of optical engines. Although it deals with the footprint of doubt, the linear current source power is low, especially in high when mains power is lower, other, calorific value is big.

although no matter where the power supply, its heat in general is to through the radiator to space, but when the power supply and light board together, the power consumed by a power supply becomes heat directly to the lamp on the board, will increase lamp board needed to disperse the heat, this will increase the LED junction temperature, reduce their life spans.

this is implied in the second engine light technical difficulties & ndash; — Heat dissipation.

10 watts of the LED ball steep light, for example, assume that power is 85% ( Linear constant current source mains voltage is higher, the lower the power) , also is the drive power LED for 8. 5 watts, the power consumed power itself is 1. 5 watts.

assumption LED power is 30%, also is the power of 70% become a hot issue. Now add the power of 1. 5 w, becomes a 7. 8 w of power, will increase the 19th. Heat 2. This power source integration to the aluminum substrate, can make the LED junction temperature also increase 15. 8% ( Because there is a loose to radiator) 。 Assume that originally LED junction temperature is 85 ℃, now the LED junction temperature will increase to 98. 4 ℃, this will reduce the LED life spans.

in this case, only need high power linear constant current source of talent over light engine, its interest is of high power and photosynthetic efficiency. Reduces the overall heating efficient driver.