基于PWM调光的无频闪恒流源LED驱动

Constant Current Source LED Driver without Stroboscopic Based on PWM Dimming

LED灯具有环保无污染、耗电少、光效高、可控性好和工作时效长等优点。随着近几年LED照明的发展,对照明的品质要求越来越高^([1])。但目前我国市面上对应的LED驱动存在不能调光、功率因数不高或者频闪等诸多缺点,不能满足高品质照明的要求。这是一种基于PWM调光的无频闪恒流源LED驱动,消除单级电路带来2倍工频纹波,又考虑到单位输出功率的成本,驱动由AC-DC和DC-DC 2阶电路组成。设计的LED驱动器具有调光、功率因数高、无频闪、输出电流可调等优点。结合了PWM调光的优点,但规避它的缺点,能以低廉的成本在公建、别墅等大规模应用。若配合智能照明系统还可以实现按需开灯、调光等功能,达到节能的目的。

LED lamp has the advantages of environmental protection, no pollution, low power consumption, high luminous efficiency, good controllability and long working time. With the development of LED lighting in recent years, the quality of lighting is getting higher and higher. But at present, in our market, the corresponding LED driver is no dimming function, low power factor or stroboscopic and many other shortcomings which can not meet the requirements of high-quality lighting. This is a constant current cource LED driver without stroboscopic based on PWM dimming, to eliminate the single-stage circuit 2 times frequency ripple, and considering the power output of the unit cost, driven by AC-DC and DC-DC 2 order circuit. The design of the LED driver has the advantages of dimming, high power factor, no flicker, whose output current can be adjusted. Combined with the advantages of PWM dimming, the design avoids disadvantages and can be used in public buildings, villas, etc.. The intelligent lighting system can also realize the function of on-demand dimming lights to achieve the purpose of energy saving.