In the current market is flooded with LED lighting products , their power input system into two categories : one for the front of the rear end of the AC power input system coupled with constant current control module, such products include freezer lights, indoor lighting, street lights, lamp , MR16, AR111 , etc. Another direct input AC power system integration AC / DC converter and a constant current circuit , including such products such as E27 and GU10 LED lamp bulb , PAR lamps , T5 and T8LED lamps and so on.
The first category should be selected in addition to the front-end power supply design better efficiency constant-voltage power supply , the back-end constant power supply module is controlled by the use of product characteristics according to their efficiency better power supply design. The advantage is that the front-end AC / DC power supply , such as switching power supplies , DC adapter , such as constant-voltage power supply, optional high and more than a safety certification program , designed to reduce the threshold .
The second class of power supply design due to the integration of the AC / DC circuit and a constant current circuit , it can meet the design space of the smaller agencies , but the power factor , power efficiency , and safety considerations, the design also has some difficulty. Therefore , very few such products on the market today can achieve high luminous efficiency, high power factor ( > 0.9 ) standard .
Currently LED lighting products to achieve high luminous efficiency , and become the next generation of the main light source , the primary consideration is the design of the power modules for different products to choose the right lighting design architecture . In addition , the power supply control IC must also improve power efficiency, power factor , reliability, to develop demand for LED lighting products .
