Analysis and Improvement of Ringing Loss of a Photoflash Charger Circuit
Date Issued
2009
Date
2009
Author(s)
Li, Cheng-Dung
Abstract
This thesis deals with a commonly-used flyback charger circuit for photoflashpplications. Recently control scheme for such a photoflash circuit has been popular. Inuch a scheme, the power switch is turned on at the instant of zero current detectionnd turned off at a specified peak current level. The focus of this thesis is to understandhe phenomenon of current ringing often encountered at the MOSFET turn on, whichurts the efficiency.he circuit operation will be analyzed by the use of converter equivalent circuits.arameters relevant to the ringing phenomenon will be pinpointed. And a scheme toelay the turn on of the MOSFET will be proposed to alleviate the ringing problem. Anxperimental bread board was built and tested.
Subjects
photoflash
flyback
boundary mode
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-98-R96921019-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):1702c00ef2b692d1e5bafb2d32ff17dd