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Unified theory of extended-period quasiresonant converters

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2 Author(s)
K. W. E. Cheng ; Dept. of Electr. Eng., Hong Kong Polytech., Hung Hom, Hong Kong ; P. D. Evans

A switching technique for the conversion of an ordinary switch or quasiresonant switch into an extended-period resonant switch is presented. The advantages are that a converter operates under zero-current or zero-voltage switching conditions and can be controlled by either switching frequency or duty ratio or both for the regulation of the output power. Families of extended-period circuits have been developed, and the theory of the extended-period switches is explained. Analysis, simulation and experimental test are used to verify the theory. A number of applications including DC/DC converters, power factor correction, off-line power supply and transcutaneous electrical nerve stimulation are presented

Published in:

IEE Proceedings - Electric Power Applications  (Volume:147 ,  Issue: 2 )