Multiple Stream Output LED Driver Power

After the development of industrial for hundreds of years, contraction oftraditional energy and revelation of environmental problems caused by the contractionhave been standing out. The development of new energy meets a bottleneck, thus thelighting consumption which accounted for17percent of the world’s total generatingcapacity has been taken a lot of attention. Without hesitation, LED, with its improvinglight efficiency and lower production costs, takes the new life for the reform oftraditional energy. LED’s long life, high brightness, no environmental pollution, andenergy-saving effect are gradually recognized by human being. However, its need ofspecified drive power has become an obstacle to the popularity of LED.This thesis aims to design a prototype for the drive power of the home-basedhigh-power lighting directing at the lighting characteristic of LED, which has a multi-channel current output200W power. After the analysis of the LED luminous principleand its luminescence properties, and comparison between the advantages anddisadvantages of the existing control strategies and drive power, three stages ofstructure-driven powers are selected, which can effectively improve system powerfactor and electromagnetic interference (EMI), and has the advantage of the wide inputvoltage and constant current output. The first stage uses a buck-boost converter, whichcan realize the buck-boost control, and ensure a wide voltage input power supply tomeet a wide range of applications, and improve the combination of existing PWM andPFM control mode to control mode, further reducing load severity board edge changesthe switching losses. Middle-class selection of LLC-resonant circuit, to isolate inputfrom output, and apply soft-switching technology into improve overall powerefficiency. In this thesis, a detailed analysis of work patterns and the equivalent modelof the resonant converter, Selection of PFM control L6599chip to meet therequirements of high-frequency switching power supply and high efficiency, alsofurther reduce the volume of power. The final stage is a more critical one, areresponsible for the overall performance of the entire power，buck converter with the inhibitory effect of the input disturbance can further reduce the input of constantcurrent output. The final stage of buck selection as a constant current flow level, canweak the output current ripple. In addition, selection of multiple streams can reducethe current on each branch, and reduce the cost of the selected switch.Aiming at the above proposed scheme, the using of MATLAB/Simulinksimulation, the simulation results can meet the design requirements, which can rightlyverify the feasibility of this program.