A Synchronized-Off Voltage-Mode Master-Made-Modulation Control Scheme for Interleaved CRM Converters
Date Issued
2012
Date
2012
Author(s)
Ku, Chung-Ping
Abstract
In recent years, interleaving of converter modules has become an attractive approach to increase converter output power capability. To do so for converters with constant-switching-frequency operation, it is relatively easy and that has been implemented in many commercial practical products. However, for converters with variable-switching-frequency operation, conventional interleaving scheme presents a problem.
In this dissertation, this issue is addressed. There are schemes reported that solves such problems but those are often suffering from increased circuit complexity, and/or additional sensing requirements that increases the overall cost. This problem is analyzed from which new control scheme is proposed in the dissertation. A synchronized-off voltage-mode master-made-modulation (SFVM-M3) scheme is proposed to address this issue while retaining the basic advantages of voltage mode control.
While the proposed scheme has wider practical implication, the focus in this dissertation is to apply this scheme to a critical mode (CRM) power factor correction (PFC) circuit which becomes popular choice in recent years in medium power (about 200 Watts) applications. In a critical mode PFC, it’s a constant on-time variable frequency switching and, therefore, it presents an interleaving problem. The proposed scheme is an elegant approach to solve this problem. Simulations and experiments are conducted to verify the proposed control scheme in the dissertation. The combination of critical mode PFC power modules and the proposed control scheme makes it an attractive approach to higher power PFC applications.
Subjects
Critical Mode (CRM)
Synchronized-off voltage mode (SFVM)
Master-made-modulation control
Power factor correction (PFC)
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-101-D95921012-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):1a50fbb41b7e76ce2e79d1bd35889e90