The reason LED lighting driver circuit failure

　　In recent years, engaged in LED manufacturing, and research and development personnel increased significantly. LED enterprise so mushrooming growth. Due to engage in research and development of LED drive many businesses and people, their skill levels, developed by the LED driver circuit quality mixed. LED lamps often lead to failure occurs often hindered the promotion of LED lighting. LED lamps from the power supply and the failure of one drive fails, the second is derived from the failure of the LED device itself. Try this article from the actual LED power driver circuit this regard, the analysis of its working principle of the circuit, and then try from under the LED drive circuit different environments, sensitive analysis of the influence of various parameters on the failure of the work to be failure modes analysis, and finally, to verify the simulation results. Solution given theoretically fail.

　　LED is a semiconductor material made of light-emitting diodes, can only be a single conduction, and its turn-on voltage is not high, the forward current is not too large, so the LED power supply has certain requirements, then the LED drive circuit emerged. In actual use, most products are used alternating LED as LED driving circuit power supply input circuit by the drive circuit into a voltage output or a current output in the form of the form. LED drive circuit, according to different criteria for the classification can be divided into many types, currently driving principle of the circuit, can be divided into two categories: one for the linear drive circuits, one for switching drive circuit.

　　Linear drive circuit, LED brightness as a function of the current through, regardless of the increase in the pressure drop at the LED. As can be seen from the above circuit diagram, linear LED driver circuit, the structure is simple, easy to implement, the development cycle is short, low production cost, small size, and, because there is no use of a lot of large-capacity capacitors and inductors, circuit design does not require consider EMI problems. Low current can be applied to a lighting system.