Analog Compensator Design for a Multi-Mode Controlled Flyback Converter
Date Issued
2015
Date
2015
Author(s)
Lin, Kuan-Yu
Abstract
Flyback converter configuration has been a popular choice for many power electronic applications for many years. Recently, a so-called multi-mode control (MMC) scheme has been reported to improve the overall performances for applications requiring wide line voltage and wide load range such as the computer power systems. The idea of MMC is to provide different control strategies according to the load level. When the load is heavy, quasi-resonant (QR) control mode is used. When the load is reduced, a discontinuous conduction mode (DCM) is used. When the load is very light such as in the computer sleeping mode, frequency-foldback mode (FFM) is used. This way, the converter overall efficiency can be improved. In this thesis, the feedback behavior of the MMC flyback converter will be analyzed using the small-signal model. Since one compensator is used for the three different modes of control, an analysis is given for the control loop gain bandwidth and stability margin for each mode. Based on this analysis, a design procedure is developed for the feedback compensator design. Simulations are conducted to verify the theoretical results. The procedure is also extended to the so-called USB-PD (Universal Serial-Bus Power Delivery) power that is an up-and-coming household DC converter application for charging mobile devices. For the USB-PD applications, the converter output voltage contains three different voltage levels. The results obtained from this thesis provide useful information for such applications.
Subjects
Flyback Converter
Multi-Mode Control
Compensator Design
USB Power-Delivery
Type
thesis
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ntu-104-R02921020-1.pdf
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