基于反激变换器的无电解电容LED驱动电源研究

发布时间：2018-06-28 12:34

本文选题：反激变换器 + 无电解电容　；参考：《广西大学》2016年硕士论文

【摘要】：LED作为一种新的固态光源,相对于传统的荧光灯、白炽灯具有显著的高效率、体积小、寿命长、环保效益高、节能等优势,被广泛用于住宅和商业照明。LED的使用寿命在理论上可以达到10万小时,而在实际生活中由于受到LED驱动电路中电解电容的使用寿命的限制而大打折扣。本文的研究目的是在不影响驱动电路正常工作的前提下减小储能电容的电容值,从而实现由陶瓷电容或者薄膜电容取代电解电容,提高LED驱动电路的使用寿命。首先,论文对LED驱动电路中boost、buck、flyback三种典型的DC/DC驱动电路的原理进行介绍,结合本设计的实际需要而采用带有电气隔离的flyback驱动电路作为本设计的电源拓扑,并对flyback变换器不同的工作模式下的工作状态进行分析,还对去电解电容的实现机理和实现方法进行分析说明；其次,对LED驱动电路中的EMI滤波整流电路、功率因数校正电路、漏极箝位保护电路、储能模块电路、LED串联保护模块以及变压器设计进行了详细的理论推导和计算；然后,对反馈控制电路中的PID控制器的参数进行理论推导计算,并选用UC3842控制芯片实现电路的反馈控制；最后,通过Multisim仿真平台搭建反激变换器的无电解电容LED驱动电源电路,仿真电路中有效地将储能电容值降至2μF,输出电流纹波10%,仿真结果表明本设计满足LED驱动电源的性能指标要求。
[Abstract]:Led as a new solid-state light source, compared with the traditional fluorescent lamp, incandescent lamp has the advantages of high efficiency, small size, long life, high environmental benefit, energy saving and so on. It is widely used in residential and commercial lighting. The service life of LED can reach 100000 hours in theory, but in real life it is limited by the life of electrolytic capacitance in LED drive circuit. The purpose of this paper is to reduce the capacitance of the energy storage capacitor without affecting the normal operation of the drive circuit, so that the electrolytic capacitance can be replaced by the ceramic capacitor or the thin film capacitor, and the service life of the LED drive circuit can be improved. First of all, the paper introduces the principle of three typical DC / DC driving circuits in LED driving circuit, and adopts the flyback drive circuit with electrical isolation as the power topology of this design combined with the actual needs of the design. At the same time, the working state of flyback converter in different working mode is analyzed, and the realization mechanism and realization method of electrolytic capacitor are analyzed. Secondly, the filter rectifier circuit and power factor correction circuit in flyback driving circuit are analyzed. Drain clamp protection circuit, energy storage module circuit, LED series protection module and transformer design are deduced and calculated in detail. Then, the parameters of pid controller in feedback control circuit are theoretically deduced and calculated. The UC3842 control chip is used to realize the feedback control of the circuit. Finally, the non-electrolytic capacitive LED driving power supply circuit of the flyback converter is built through the Multisim simulation platform. In the simulation circuit, the energy storage capacitance is effectively reduced to 2 渭 F and the output current ripple is 10. The simulation results show that the design meets the performance requirements of LED drive power supply.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM46

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