Dissertation > Excellent graduate degree dissertation topics show

Design of 200W LED Driver with Style of Active-Clamp Forward Switching Power Supply

Author: GuoLinZhong
Tutor: QinHuiBin
School: Hangzhou University of Electronic Science and Technology
Course: Circuits and Systems
Keywords: LED lighting Forward active clamp Drive power Switching Power Supply Soft-switching technology
CLC: TN312.8
Type: Master's thesis
Year: 2009
Downloads: 261
Quote: 1
Read: Download Dissertation

Abstract

LED (Light Emitting Diode) light source has energy-saving, environmental protection, long life, safe and reliable, small size, color diversification, easy regulation, is being more and more people accepted and recognized, is considered to be the fourth generation light source representatives. LED applications, the need for a suitable driver control circuit so that it more fully advantage of play, the main contents of the thesis is to drive power to the LED light source design is reasonable. Firstly, by contrast a brief description of the advantages of the LED light source overview of the application development and looking forward to the prospects of its application. Secondly, the LED light-emitting principle is elaborated further gives the relationship between the voltage, current and output light power of the LED light source. The analysis and comparison of several common LED driver - the advantages and disadvantages of switching power supply topology eventually selected forward active clamp switching power supply as a main circuit topology. Switching power supplies and linear power compared with the small size, light weight, high efficiency, and gradually developed into a mainstream form of power. The paper gives an important part of the circuit parameters specific design process, the focus of the design is the key part of the high-frequency transformer in the forward active clamp drive. The specific parameters of the transformer according to the measured data in the practical application of the amendment, and pointed out the key factors that affect the performance indicators in the transformer manufacturing process and solution. This thesis is based on the NCP1280 PWM controller as the core design of the LED driver. A reasonable analysis and design of the NCP1280 controller peripheral circuit design, the use of the feedback loop designed with the power of the driving voltage, current control and protection circuit. And considering the problems often encountered in the small and medium power switching power supply circuit special thermal design, EMC design, prototype meet the EMC standard GB17743 lower temperature rise. A serious problem of high frequency switching losses in the switching power supply, zero voltage and zero current shutdown, soft-switching technology, power LED driver debugging, waveform data observed parameter modification has important guiding significance for the optimization of circuit . Finally 200W/36V output of the prototype power debug, analysis of the results of the pilot test and recommendations for improvements. Looking ahead to the application prospects and practical significance, and to do for a long time observing the output of the test circuit stability.

Related Dissertations

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Semiconductor technology > Semiconductor diode > Diodes: structure and performance > Light-emitting diodes
© 2012 www.DissertationTopic.Net Mobile