Dissertation > Excellent graduate degree dissertation topics show

Research on Led Street Lamp Driver and Its Reliability Tolerance Design

Author: ZhangBinRui
Tutor: WangShuJuan
School: Harbin Institute of Technology
Course: Electrical Engineering
Keywords: LED street lamp Constant-current driver Reliability Tolerance design Single ended flyback converter
CLC: TN86
Type: Master's thesis
Year: 2009
Downloads: 315
Quote: 3
Read: Download Dissertation

Abstract

In recent years, it has became an important step to use LED street lamps in city roadway lighting system which have the advantages of green, energy saving, safe and reliability. This lighting solution can help cities with building the conservation-oriented society, and has a broad market space. Because the open-air work condition of LED lamps is rather rough, the LED driver urgently desires good performance and high reliability. Presently, there still exist problems such as low output power, low convert efficiency, low power factor, bad stability of output current and mismatching of LED lamps’and their drivers’life, which have became the bottleneck to promot and apply the LED lighting equiments furtherly. Therefore, developing the good performance and high reliability LED lamp drivers has a significant practical value. This paper design a kind of LED lamp driver which has the function of power factor correction and all kinds of protecting approaches and can drive the high power LED street lamp. Then this paper researchs an improved method of reliability tolerance design for the LED street lamp driver which can keep the stability of output current.This dissertation developes a design scheme of constant-current driver according to the series mode LED lamp and qualifications, which adopts the single ended flyback DC-DC converter as the main topology and has an active power factor correction circuit.This dissertation has implemented parameter design for the LED street lamp driver. In this paper, a protecting circuit on the input side has designed which has the functions of overpressure protection, overcurrent protection and suppressing differential/common mode interference; an active power factor correction circuit has been design which use the critical conduction mode; and a single ended flyback DC-DC converter which works in the CCM mode, adopts the current controlled PWM chip and has constant output current. A computer model of this circuit has been built and simulated to validate the parameter design.In order to ensure the output current stay in the allowed tolerance rang, an improved reliability tolerance design method of electronic products has been developed. This method sufficiently considers the effects of performance parameters caused by parameter deviation, environment influence and degradation effect, develops an approach to calculate the reliability based on tolerance principle and an approach of tolerance scheme selecting based on the least cost principle. Then, the reliability tolerance design of output current of the LED street lamp driver has implemented using this method.The performance test and the reliability test of the driver shows that the driver can meet the qualifications completely.

Related Dissertations

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Radio equipment,telecommunications equipment > Power supply
© 2012 www.DissertationTopic.Net Mobile