Lamps are the necessary decorations in modern home decoration, LED is the more popular light source technology, not only good heat dissipation performance, but also the pollution of the environment is small, very environmentally friendly. What is the principle of LED energy-saving lamps? Let’s learn more about it.
What is the principle of LED energy-saving lamps]
A, what is LED energy-saving lamps
Led light, is a light-emitting diode. This light-emitting diode is a semiconductor device capable of converting electrical energy into a solid state, which can directly convert electricity into light. It is worth noting that Led lights have a large projection range and no strobe, which does not harm the eyes. Power is also very strong, 15W brightness equivalent to ordinary 40W fluorescent lamps, very energy-efficient and convenient to use.
Led lights are not harmful metals, so the broken lights are easy to recycle, the pollution of the environment is small, very environmentally friendly; this light is very durable, long life; led can be mixed through the red, green and blue colors out of the seven colors, mixed colors are very colorful, color is also very pure. Of course, led lights also have their flaws, that is, its high price, the current use of its relatively small population, the use of relatively small.
Second, the LED energy-saving lamps working principle
LED energy-saving lamps is a solid-state semiconductor devices also known as light-emitting diodes. the heart of the LED is a semiconductor chip and one end of the chip attached to a bracket, one end is the negative end of the other end connected to the positive end of the power supply, so that the entire chip is epoxy resin encapsulated. The semiconductor wafer is composed of three sectors, one is the P-type semiconductor in which holes dominate, the other end is the N-type semiconductor in this side is mainly electrons, and the middle is usually 1 to 5 periods of quantum wells. When the electricity flows smoothly through the wire acting on this wafer electrons and holes will be pushed to the quantum well, and then in the quantum well electrons and holes compound, after the form of photons will be issued in the form of energy, which is the principle of LED light.
LED energy-saving lamps have a small size, low power consumption, long life, non-toxic environmental protection and many other advantages, LED lamps from outdoor decoration, engineering lighting, and gradually developed to home lighting. As we all know, the invention of energy-saving lamps to make people further away from the darkness, ushered in the light, because it is cheaper than incandescent lamps and good production, higher brightness, so it has been a large number of applications, and gradually replace the trend of incandescent lamps. But energy-saving lamps contain mercury and other harmful substances, too much pollution to the environment. LED lights were born, because it is cheaper and better than the comparative, so it has been used in a large number of applications, and gradually replace the trend of energy-saving lamps.
Third, the classification of LED energy-saving lamps
LED energy-saving lamps are rich in variety, currently on the market, basically by three types.
One type: LED energy-saving lamps made of small power LED straw hat type, the power supply using resistive capacitive buck circuit. Straw hat LED extended indicator LED packaging form, epoxy resin packaging, so that the LED chip can not dissipate heat, light decay is serious, many white LED, after a period of time, the color temperature becomes high, gradually into the blue, becoming dim.
There are also manufacturers committed to the development of low light decay straw hat type LED, but because there is no change in the form of packaging, light decay is still no major improvement. This type of LED energy-saving products, for transitional products, low prices, poor quality.
Type II: LED energy-saving lamps made of 3528 or 5050 SMD medium-power LED, power supply is also commonly used capacitive buck circuit, there are some manufacturers use constant current circuit, compared to the straw hat LED, SMD LED heat slightly better, there is a heat-conductive substrate, in conjunction with the aluminum substrate, can be part of the heat export. But because it still ignores the heat of the LED, many medium-power SMD LED energy-saving lamps, no heat sink, still use plastic housing, light decay is still serious. The use of capacitive buck low-end power supply, because the grid voltage instability, current fluctuations, brightness also fluctuate, moderate price, slightly better quality.
Three types: LED energy-saving lamps made of high-power SMD LEDs, power supplies commonly use constant current isolation circuit, that is, there is a constant current, such as 5W LED, usually using five 1-watt LED chips, series connection, using a constant current source of 300mA power supply, wide voltage power supply, so that when the grid fluctuations, the current has not changed, the luminous flux that the brightness to maintain a constant, 5 SMD LEDs welded in aluminum On top of the aluminum substrate, the aluminum substrate is then combined with the heat sink, the use of heat can be quickly dissipated in a timely manner to ensure that the LED chip temperature is lower than the LED allowable junction temperature, thus ensuring the true effective life of LED energy-saving lamps. This type of LED lights high price, good quality, but also the development direction of LED energy-saving lamps.
