Modeling and control of an active-clamp discontinuous conduction mode flyback converter (ADCMFC)

Pao Yue-kong Library Electronic Theses Database

Modeling and control of an active-clamp discontinuous conduction mode flyback converter (ADCMFC)


Author: Kok, Siu-kam
Title: Modeling and control of an active-clamp discontinuous conduction mode flyback converter (ADCMFC)
Degree: M.Sc.
Year: 1996
Subject: Electric current converters
Power resources
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Pages: x, 95 leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: Power supply is the source of the energy for electronic products. No matter how good the electronic product is, it must need a power supply. Therefore, the advancement in the power supply would affect all the electronic products. With the trend of miniaturization in the electronic products, the power supply is needed to reduce the size. Actually, there is already a great reduction in size when the power supply topology changes from linear transformer type to switching mode. To further reduce the size, the switching frequency has to be increased. However, there is quite a lot of limitations to cope with when the switching frequency is further increased. The major problem is due to the thermal performance. In high frequency switching condition, the switching elements such as the power MOSFET and the output rectifier diode will dissipate quite a lot in switching loss. And they would be in thermal run-away at the worst case. The active-clamp discontinuous mode flyback converter ( ADCMFC ) introduced in this dissertation is one of the solution to solve the problem in high switching frequency. It can achieve the zero voltage switching ( ZVS ) to the power MOSFET and the zero current switching ( ZCS ) to the output rectifier diode. To further investigate the ADCMFC, this dissertation will introduce an optimization method to extract its transfer function from a prototype. Besides, the control method will also be discussed by using classical and modern control. Finally, the comparison between classical control and modern control will be discussed.

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