Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Electronic and Information Engineering | en_US |
| dc.creator | Liu, Kaiyu | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/6876 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | - |
| dc.rights | All rights reserved | en_US |
| dc.title | A capacitor-less and low-ripple power supply circuit design for LEDs | en_US |
| dcterms.abstract | Considering that over 20% of the world electricity generation is consumed by electric lighting, it is believed that a major energy saving is possible when light emitting diodes (LEDs) are ultimately adopted for general lighting. LED has various performance aspects, the lifespan is one of them which greatly affects the quality of LED lighting system. Since LEDs operate at low DC voltage, power converters are required to transform the AC mains power into DC power. Although high power efficiency is typically achievable in modern power converters, they generally suffer from premature failure due to the malfunctioning of electrolytic capacitors, which is a critical component in AC-DC power conversion. To the consumers, this is highly undesirable due to the high replacement cost involved and must be avoided. The proposed project aims to reduce the electrolytic capacitors in a certain extent at the expense of a little efficiency. In this paper, according to the characteristic of LED, a flyback circuit with a new linear constant current circuit will be designed and realized. Simulation and hardware testing will be given to identify the feasibility of the circuit. | en_US |
| dcterms.extent | v, 51 leaves : ill. ; 30 cm. | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2012 | en_US |
| dcterms.educationalLevel | All Master | en_US |
| dcterms.educationalLevel | M.Sc. | en_US |
| dcterms.LCSH | Light emitting diodes. | en_US |
| dcterms.LCSH | Electronic circuit design. | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | restricted access | en_US |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b25315778.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.91 MB | Adobe PDF | View/Open |
Copyright Undertaking
As a bona fide Library user, I declare that:
- I will abide by the rules and legal ordinances governing copyright regarding the use of the Database.
- I will use the Database for the purpose of my research or private study only and not for circulation or further reproduction or any other purpose.
- I agree to indemnify and hold the University harmless from and against any loss, damage, cost, liability or expenses arising from copyright infringement or unauthorized usage.
By downloading any item(s) listed above, you acknowledge that you have read and understood the copyright undertaking as stated above, and agree to be bound by all of its terms.
Please use this identifier to cite or link to this item:
https://theses.lib.polyu.edu.hk/handle/200/6876